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n balls each of mass m impinge elastical...

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

A

`m n u`

B

`2 m n u`

C

`4 m n u`

D

`(1)/(2) m n u`

Text Solution

Verified by Experts

The correct Answer is:
B
Change in momentum of the ball `= 2m u` , where `n` is the number of balls / second.
`F = (Delta p)/(Delta t) = 2 n m u`
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