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Two bodies P and Q are of mass m and 5 m and with velocities v & 5 v respectively. Assuming bodies are moving with uniform velocities, compare the

force required to stop them.



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Momentum of P = m v
Momentum of Q = 5m 5v = 25 mv
Ratio of momenta P : Q  =  1 : 25

Force is time rate of change of momentum. Assume that they are stopped in the same duration.

THen ratio forces =  mv /t  :  25 mv /t    = 1 : 25

1 5 1
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