The brakes are applied to a moving truck, causing it to uniformly slow down. While slowing, it moves a distance of 40.0 m in 7.15 s to a final velocity of 1.45 m/s, at which point the brakes are released. (a) What was its initial speed (in m/s), just before the brakes were applied?  m/s (b) What was its acceleration (in m/s2) while the brakes were applied? (Assume the initial direction of motion is the positive direction. Indicate the direction with the sign of your answer.)  m/s2

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter2: Motion In One Dimension
Section: Chapter Questions
Problem 23P: The driver of a car slams on the brakes when he sees a tree blocking the road. The car slows...
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The brakes are applied to a moving truck, causing it to uniformly slow down. While slowing, it moves a distance of 40.0 m in 7.15 s to a final velocity of 1.45 m/s, at which point the brakes are released.
(a)
What was its initial speed (in m/s), just before the brakes were applied?
 m/s
(b)
What was its acceleration (in m/s2) while the brakes were applied? (Assume the initial direction of motion is the positive direction. Indicate the direction with the sign of your answer.)
 m/s2
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