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n small balls, each of mass m and veloci...

n small balls, each of mass m and velocity u strike elastically on a surface per second. The force exerted on the surface

A

2mnu

B

2mu

C

`(2"mu")/n`

D

mnu

Text Solution

Verified by Experts

The correct Answer is:
A
Force `= ("Change in momentum")/("Time") = (m xx" Change in velocity")/("Time")`
In each second, n balls impinge and convey momentum to the surface.
Foce = `(m xx2"nu")/(1) = 2` mnu
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