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If speed of a body is varying, its velocity must be varying and it must have non-zero acceleration.

If velocity of a body is varying, its speed must be varying.

A body moving with varying velocity may have constant speed.

A body moving with varying speed may have constant velocity if its direction of motion remains constant.

answer is A, C.

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Detailed Solution

If speed changes, magnitude of velocity changes which means the velocity is varying .

When direction of velocity changes keeping its magnitude constant ,velocity is varying without varying speed

eg. uniform circular motion.

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