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Question

A ball of mass 0.45 kg is heading towards a wall with a speed of 25 m/sec. After hitting the wall the ball bounces back with a speed of 20 m/sec. The ball was in contact with the wall for 0.003 seconds. What is the average force the wall exerts on the ball?

A
760 N
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B
3000 N
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C
3750 N
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D
6750 N
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Solution

The correct option is D 6750 N
From impulse - momentum equation
(F)×Δt=m(VfV0)
Given, V0=25m/sec,Vf=20m/sec
Δt=0.003seconds
m = 0.45 kg
F=0.450.003(2025)
​​​​​​​=6750N

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