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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

2 mnu

B

2mu

C

`( 2 m u)/(n)`

D

mnu

Text Solution

Verified by Experts

The correct Answer is:
A
Force `= ("Change in momentum")/("Time") = ( mxx C "Change in velocity")/("Time")`
In each second, n balls implnge and convey momentum to the surface,
Force `= (m xx n u)/( 1) = 2 m n u `
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