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Subject :NSO    Class : Class 9

A ball is dropped on to the floor from a height of 10 m. It rebounds to a height of 2.5 m. If the ball is in contact with the floor for 0.01 seconds, what is the average acceleration during contact?

(A) 1400 m/s2

(B) 2100 m/s2

(C) 700 m/s2

(D) 2800 m/s2.

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