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Q.

A surface is hit elastically and normally by n balls per unit time, all the balls having the same mass m and moving with the same velocity u .The force on the surface is:

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a

mnu2

b

2mnu

c

(1 /2)mnu2

d

2mnu2

answer is B.

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Detailed Solution

Force on the surface = Magnitude of rate of change of momentum of the balls = n[mu-(-mu)} = 2nmu

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A surface is hit elastically and normally by n balls per unit time, all the balls having the same mass m and moving with the same velocity u .The force on the surface is: