A car moves along an east-west road so that its velocity varies with time as sho

Question

A car moves along an east-west road so that its velocity varies with time as shown in the graph below, where west is the positive direction. For each part of this question, indicate which one or more time intervals is correct by entering the corresponding letter or letters. If more than one letter is correct, enter the letters of your answer in alphabetical order with no spaces in between. (a) During which one or more time intervals is the car slowing down? Choose all that apply. (b) During which one or more time intervals is the car moving with a constant speed? Choose all that apply. (c) During which one or more time intervals is the magnitude of the car's acceleration smallest, but not zero? Choose all that apply. (d) During which one or more time intervals is the car moving east? Choose all that apply.

Explanation / Answer

Simple and Correct:

a: Slowing Down in D, H
b: Constant speed in A, C, E, G
c: Smallest acceleration: D
d: East direction: B, C, D

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