1. A 100 g tennis ball coming at a speed of 20 m/s is
hit straight back by a bat to speed of 40 m/s. The
magnitude of the average force F on the ball. when
it is in contact for 5 ms with the bat is
(1) 1200 N (2) 6000 N (3) 2400 N (4) 1000 N
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