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A particle is moving along a straight li...

A particle is moving along a straight line.

A

If the acceleration of the particle is more than that of another object, the particle is moving faster.

B

If the acceleration is positive, the speed must be increasing.

C

If the acceleration and the velocity have the same sign, the speed must be increasing.

D

If the acceleration is zero, the velocity is constant but the speed may be changing.

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The correct Answer is:
C
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