A body of mass us m is moving with velocity u, after collinding with a wall it retunes back with velocity u. How much is the change in the momentum of the body?
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Change is zero because the velocity of ball after colliding remains same.
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Change in momentum =final momentum -initial momentum
Let P be change in momentum and p2 ,p1 be initial and final momentum
P=p2-p1
=mu-mu. (p=mass×velocity)
=0
This shows that momentum is constant throughout the motion or if you could understand it's a constant vector.
In accordance with the law of conservation of momentum the momentum remains unchanged as in the absence of external force.
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