Question

two boys are left in the middle of a frictionless floor one boy of mass 20kg gives a blow of 100N lasting one milli second to the other he himself will move with speed of

Answer 1

F = mv/t
v = Ft/m
v = (100 * 10^-3) / 20
v = 0.005 m/s

He will move with the speed of 0.005 m/s

Answer 2

We know that force=change in
momentum/time
F=mv/t
100=20(v)/1/1000
v=0.005m/s
He will move with 0.005m/s

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