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Which of the following four statements is false.

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A body can have a constant velocity and still have a varying speed

A body can have a constant speed and still have a varying velocity

A body can have zero velocity and still be accelerated

The direction of the velocity of a body can change when its acceleration is constant

answer is B.

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Detailed Solution

Speed is the magnitude of the velocity. In order to have constant velocity, the speed needs to be constant.

Velocity changes when either or both of speed and direction changes.

When a ball projected upward, at maximum height , velocity is zero but acceleration is not zero.

For motion of an object under gravity , direction of velocity changes at maximum height while acceleration is constant.

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