COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 2, Problem 7QAP
To determine
What happens to an object's velocity when the object's acceleration is in the opposite direction?
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Students have asked these similar questions
EXAMPLE 34 The acceleration a of a particle
moving with an initial velocity u varies with distance x as
a=kVx wherek is a constant. The distance covered by the
particle when its velocity becomes 3u is given by
2 \2/3
3u?
(a)
k
(b) (3ku²)^3
4/3
2/3
2
2/3
(c)
k
(d)
0 amiT
3k
39. •What are the magnitude and direction of the change
in velocity if the initial velocity is 30 m/s south and the
final velocity is 40 m/s west?
44. ••Cody starts at a point 6 km to the east and 4 km
to the south of a location that represents the origin of
a coordinate system for a map. He ends up at a point
10 km to the west and 6 km to the north of the map
origin. (a) Find his average velocity if the trip took him
4 h to complete. (b) Cody walks to his destination at a
constant rate. His friend Marcus covers the distance with
a combination of jogging, walking, running, and resting
so that the total trip time is also 4 h. How do their aver-
age velocities compare?
Chapter 2 Solutions
COLLEGE PHYSICS
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- 79. •Sports Gabriele Reinsch threw a discus 76.80 m on July 9, 1988, to set the women's world record. Assume that she launched the discus with an elevation angle of 45°, and that her hand was 2.0 m over the ground at the instant of launch. What is the initial speed of the discus required to achieve that range? (Neglect any effects due to air resistance.) SSMarrow_forward43. ••An object experiences a constant acceleration of 2.0 m/s? along the -x axis for 2.7 s, attaining a velocity of 16 m/s in a direction 45° from the +x axis. Find the initial velocity vector of the object.arrow_forwardEXAMPLE 34 The acceleration a of a particle moving with an initial velocity u varies with distance x as a=kVx wherek is a constant. The distance covered by the particle when its velocity becomes 3u is given by 2/3 3u? 342 4/3 (a) (b) (3ku² )"3 k 2/3 2/3 (c) k .2 u (d) 3karrow_forward
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