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1.
How much time is needed by a car to accelerate from 15.0 m/s to 35.0 m/s if it has a constant acceleration of 5.0 m/s2?
2.
Norma can run a 10km distance in 55 minutes while Ofel can make it in 50 minutes. (a) Calculate Norma’s average speed in m/s and km/h. (b) Calculate Ofel’s speed in m/s and km/h.
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- A car is traveling at a speed of 33 m/s. (a) What is its speed in kilometers per hour? (b) Is it exceeding the 90 km/h speed limit?An ice sled powered by a rocket engine sum from rest on a large frozen lake and accelerates at + 40 ft/s2. After some time t1, the rocket engine is shut down and the sled moves with constant velocity v for a time t2. If the total distance traveled by the sled is 17 500 ft and the total time is 90 s. find (a) the times t1 and t2 and (b) the velocity v. At the 17 500-ft mark, the sled begins to accelerate at 20 ft/s2. (c) What is the final position of the sled when it comes to rest? (d) How long does it take to come to rest?A student writes, "A bird that is diving for prey has a speed of -10 m / s." What is wrong with the student's statement? What has the student actually described? Explain.
- (a) Explain how you can determine the acceleration over time from a velocity versus time graph such as the one in Figure 2.56. (b) Based on the graph, how does acceleration change over time?. A rocket accelerates from rest at a rate of 64 m/s2. (a) What is its speed after it accelerates for 40 s? (b) How long does it take for the rocket to reach a speed of 7,500 m/s?5. An object released from rest, falls toward the earth with an acceleration of 10 m/s. Fill in the table below. Hints: For an object starting from rest, v-at. Displacement is the distance from the starting point. For an object starting from rest, d=1/2gt². Use 10m/s as the value of g. Time Velocity (s) (m/s) Displacement(m) 2 3 4 6. 8. 9.
- 1. New York to San Francisco. It travels at an average speed of 500 miles per hour. What is the distance between the two cities? 2. A Truck is moving from rest and attained a velocity of 80 m/s. Calculate the acceleration of the Truck after 5 s? 3. A Marble is dropped from the top of a building. After 2 seconds, it’s velocity is measured to be 19.6 m/s. Calculate the acceleration for the dropped marble 4. A canonis fired with amuzzle velocityof 300m/s at an angle of 600 what is its range?.1. Below is a velocity-time graph of a marathon runner running down a racetrack over a period of 8 seconds. v (m-s-1) t(s) A. Solve for the acceleration of the runner during the first 4 seconds.1.A sprinter runs 500 m sprint for 44.2 seconds. What is his average speed? Calculate answer to one decimal. 2.How far does a car going 22 m/s travel in 22.7 min. Give answer in meters. Calculate answer to one decimal 3.Initially stationary, a train has a constant acceleration of 0.3 m/s What is its speed after 12.6s. Calculate answer to one decimal . 4.Initially stationary, a train has a constant acceleration of 1.3 m/s How far it travel after 21.6s. Calculate answer to one decimal . 5.A Skydiver jumps out of a helicopter and falls freely for 0.6s before opening the parachute. What is the skydiver's downward velocity when the parachute opens? Use g = 9.8 m/s ^ 2 Calculate answer to one decimal 6. During takeoffan airplane goes from 0 52 m/s is 5 s. What is its acceleration? Calculate answer to one decimal 7.During takeoffan airplane goes from 0 to 50 m/s is 75. How far is it going after . Calculate answer to one decimal.
- 2. Calculate the uniform acceleration of a tricycle, which a. starts from rest and reaches a speed of 10m/s in 15 seconds; b. changes its speed from 20m/s to 25 m/s in 5 seconds; c. starts from rest and travels a distance of 100m in 10 seconds; and d. slows down from a speed of 6om/s and comes to rest in 15s.15. A car started from rest and reaches a speed of 18 m/s in 25 seconds. How many seconds would it take from 18m/s to 28 m/s with the same acceleration? 14. Starting from rest, an airplane needs 500 meters of the runway, and the time required is 25 seconds. Find its speed (m/s) when it leaves the ground?Answer the following questions: 1. While on vacation, Lisa Carr traveled a total distance of 440 miles. Her trip took 8 hours. What was her average speed?2. What is the distance and the displacement of the race car drivers in the Indy 500?3. What is the displacement of the cross-country team if they begin at the school, run 10 miles and finish back at the school?4. A car accelerates from rest to a speed of 36 km/h in 20 seconds. What is the acceleration of the car in m/s2?5. A car slows down from a speed of 72 km/h to rest in 25 seconds. What is the acceleration of the car?
