Q.

When a particle moves in a circle with a uniform speed

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a

Its acceleration is constant but velocity changes

b

Its velocity and acceleration both change

c

Its velocity is constant but the acceleration changes

d

Its velocity and acceleration are both constant

answer is D.

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Detailed Solution

In uniform circular motion, the direction of velocity changes continuously from point to point, and centripetal acceleration is always directed towards the centre.

            (or)

Because whenever particle in circular motion it direction is changes continuously then

velocity changes and acceleration changes

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