College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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The cheetah is considered the fastest running animal in the world. Cheetahs can accelerate to a speed of 21.8 m/s in 2.50 s and can continue to accelerate to reach a top speed of 28.8 m/s. Assume the acceleration is constant until the top speed is reached and is zero thereafter.
1) Express the cheetah's top speed in mi/h. (Express your answer to three significant figures.)
answer: 64.2
2) Starting from a crouched position, how long does it take a cheetah to reach its top speed? (Express your answer to three significant figures.)
answer: 3.31
3) How far does it travel in that time? (Express your answer to three significant figures.)
answer: 47.5
4) If a cheetah sees a rabbit 120 m away, how long will it take to reach the rabbit, assuming the rabbit does not move? (Express your answer to three significant figures.)
answer: ?
tried 5.25 and 5.26 but does not work
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