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Question

A 1 kg particle strikes a wall with a velocity 1 m/s at an angle 30 and reflects at the same angle in 0.1 second, then the force applied by the wall on the particle will be

A
303 N
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B
0
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C
403 N
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D
103 N
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Solution

The correct option is D 103 N

Velocity component only changes perpendicular to the wall and remains unchanged along the wall.

Therefore, change in momentum of the ball perpendicular to the wall
p=p2p1=m[vcosθ(vcosθ)]
p=2mvcosθ
p=2×1×1×cos30=2×32=3,
Force = Rate of change of momentum
F=Change of momentumtime
F=30.1=103
So force =103 N.


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