Q.

A ball of mass 10 gm hits vertically a hard surface with a speed of 5 ms1 and rebounds with the same speed. The ball remains in contact with the surface for 1/100 sec . The average force exerted by the surface on the ball is.

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a

20 N

b

0 N

c

10 N

d

40 N

answer is C.

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Detailed Solution

a=ΔVt=5(5)1/100=103m/sec2

F=Ma

=10103103=10N

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