First slide

Second law

Question

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

Moderate

A

m n u
B

2 m n u
C

4 m n u
D

m n u/2

Solution

The change of momentum of each ball = 2 m u Force = rate of change of momentum $= 2 mu \times n = 2 mnu$

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