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  3. n small balls each of mass m impinge elastically each second on a surface with velocity u. The force experienced by the surface will be

. n small balls each of mass m impinge elastically each second on a surface with velocity u. The force experienced by the surface will be

a. mnu

b. 2 mnu

c. 4 mnu

d. 1/2 mnu

Best Answer

Ans: B

Sol: As the ball rebounds with same velocity therefore change in velocity = 2u and the mass colliding with the surface per second = nm 

Force experienced by the surface = F= mdv/dt= 2mnu

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