If a body of mass M collides against a wall with velocity V and rebounds with the same speed, then its change of momentum will be
Zero
MV
2MV
-2MV
A
Zero
B
2MV
C
MV
D
-2MV
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Solution
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Initial velocity of body before collision u=−V
where minus sign indicates the body moves towards the wall.
Initial momentum of the body Pi=Mu=−MV
Final velocity of body after collision v=V
where positive sign indicates the body moves away from the wall.
Final momentum of the body Pf=Mv=MV
Change in momentum ΔP=Pf−Pi=MV−(−MV)=2MV
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