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An object that' s moving with constant s...

An object that' s moving with constant speed travels once around a circular path. True statements about this motion include which of the following ?
I. The displacement is zero.
II. The average speed is zero.
III. The acceleartion is zero.

A

I only

B

I and II only

C

I and III only

D

III only

Text Solution

Verified by Experts

The correct Answer is:
A
Traveling once around a circular path means that the final position coincides with the initial position. Therefore, the displacement is zero. The average speed, which is total distance traveled divided by elapsed time, cannot be zero. And since the velocity changed (because its direction changed), there was a nonzero acceleration. Therefore, only I is true.
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Knowledge Check

  • An object moves at constant speed in a circular path. True statement about the motion include which of the following I. the velocity is constant. II. The acceleration is constant. III. The net force on the object is zero since its speed is constant.

    A
    II only
    B
    I and III only
    C
    II and III only
    D
    NONE

  • Which one of the following represents displacement-time graph of two objects A and B moving with zero relative velocity?

    A
    B
    C
    D

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