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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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