Question

what is centripetal acceleration ?

Answer 1

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here is your answer
For a circular motion , the particles must have an acceleration which should be always directed towards the centre . Such an acceleration is called as centripetal acceleration .

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Answer 2

hey
centripetal acceleration
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Centripetal Acceleration: object moving in a circle with acceleration vector pointed to the center of the circle. 
or
Centripetal acceleration, property of the motion of a body traversing a circular path. The acceleration is directed radially toward the centre of the circle and has a magnitude ...