A ball is dropped on 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 sec, the average acceleration during contact is 

(1) 2100 m/sec2 downwards

(2) 2100 m/sec2 upwards

(3) 1400 m/sec2

(4) 700 m/sec2

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