Which of the following statements is true for a projectile launched vertically downward? a. Its y-component of velocity does not change its sign. b. Its y-component of velocity changes its sign and the x-component of velocity stays constant (and #0). c. Its velocity and acceleration are parallel. d. Its initial y-component of velocity is zero. e. Its x-component of velocity is zero.

Which of the following statements is true for a projectile launched vertically downward? a. Its y-component of velocity does not change its sign. b. Its y-component of velocity changes its sign and the x-component of velocity stays constant (and #0). c. Its velocity and acceleration are parallel. d. Its initial y-component of velocity is zero. e. Its x-component of velocity is zero.

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter3: Vectors And Two-Dimensional Motion

Section: Chapter Questions

Problem 46AP: You can use any coordinate system you like to solve a projectile motion problem. To demonstrate the...

See similar textbooks

Similar questions

Prove that the trajectory of a projectile is parabolic, having the form y=ax+bx2. To obtain this expression, solve the equation x=v0xt for t and substitute it into the expression for y=v0yt(1/2)gt2 (These equations describe the x and y positions of a projectile that starts at the origin.) You should obtain an equation of the form y=ax+bx2 where a and b are constants.
You can use any coordinate system you like to solve a projectile motion problem. To demonstrate the truth of this statement, consider a ball thrown off the top of a building with a velocity v at an angle with respect to the horizontal. Let the building be 50.0 m tall, the initial horizontal velocity be 9.00 m/s, and the initial vertical velocity be 12.0 m/s. Choose your coordinates such that the positive y-axis is upward, the x-axis is to the right, and the origin is at the point where the ball is released, (a) With these choices, find the balls maximum height above the ground and the time it takes to reach the maximum height. (b) Repeat your calculations choosing the origin at the base of the building.
A girl delivering newspapers covers her route by traveling 3.00 blocks west, 4.00 blocks north, and then 6.00 blocks east. (a) What is her final position relative to her starting location? (b) What is the length of the path she walked?
(a) Repeat the problem two problems prior, but for the second leg you walk 20.0 m in a direction 40.0° north of east (which is equivalent to subtracting B from A that is, to finding R=AB ). (b) Repeat the problem two problems prior, but now you first walk 20.0 m in a direction 40.0° south of west and then 12.0 m in a direction 20.0° east of south (which is equivalent to subtracting A from B that is, to finding R=BA=R ). Show that this is the case.
12. Which of the following statements is not valid for a projectile? Take upward direction as positive. a. The y component of the velocity of the projectile is zero at the highest point of the projectile's path. b. The x velocity on a projectile is constant at any point on its path if we ignore air resistance. c. The acceleration of the projectile is positive and decreasing when the projectile is moving upwards. d. The acceleration of the projectile is a constant negative value.
Which of the following statement is/are true? a. The velocity of projectile motion in maximum height is zero. b. The velocity of an object in uniform circular motion is constant. c. During the flight of projectile motion, its horizontal velocity remains constant. d. The acceleration in free fall at the maximum height is zero.
13. Which of the following statements is valid for a projectile? Take upward direction as positive. a. The velocity at the highest point is zero. b. The y component of the velocity of the projectile is zero at the highest point of the projectile's path. c. The acceleration on the top of the projectile is zero. d. The acceleration of the projectile is increasingly negative as the projectile descends.
An object moving along a straight line is slowing down. Which one of the following statements concerning the object's acceleration is necessarily true? Select one: a. The acceleration is positive. b. The acceleration vector is in the same direction as the displacement. c. The acceleration is negative. d. The acceleration vector is opposite to the velocity. e. The object is at rest.
Which of the following statement is/are true? a. The acceleration in free fall at the maximum height is zero. b. The velocity of an object in uniform circular motion is constant. c. The vertical velocity of projectile motion in maximum height is zero. d. During the flight of projectile motion, its vertical velocity remains constant.
An object is thrown vertically upward. At the highest point in the object's trajectory, A. velocity and acceleration are both zero. B. velocity and acceleration are both nonzero. C. velocity is zero, and its acceleration is nonzero and directed downward. D. velocity is E. velocity is zero, and its acceleration is nonzero and directed horizontally. F. None of those zero, and its acceleration is nonzero and directed upward.
Which among the following statements is CORRECT? A.) The vertical component of the acceleration of a projectile is zero during the entire flight. B.)The vertical component of the velocity of a projectile remains contant during the entire flight. C.)The horizontal component of the velocity of a projectile remains contant during the entire flight. D.)The maximum height reached by a projectile does not depend on its initial speed.
The vector r indicates the instantaneous displacement of a projectile from the origin. At the instant when the projectile is at r, its velocity and acceleration vectors are v and a. Which statement is correct? a is always perpendicular to v,. a. b. v is always perpendicular to r. a is always perpendicular to r. a is always perpendicular to v,. d. a is always perpendicular to v. e. Clear my choice