First slide

Second law

Question

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

Easy

A

mnu
B

2mnu
C

4mnu
D

mnu/2

Solution

$F_{avg} = ma, a = \frac{v - u}{t}$ v=-u
F_avg=m $\frac{(- 2 u)}{t}$ =-2mun

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