A classical mechanics problem by Karthik Rocks
Classical Mechanics
Level
3
A force of 100 N acts on a mass of 5 kg for 10 s . If the mass starts from rest ,after 10 s ,it starts to move with uniform velocity and collides with a wall . After collision it comes back with the same speed and direction. Then change in momentum before and after collision is :
zero
2000 kg m/s
20 kg m/s
200 kg m/s
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1 solution
We use here F = dp/dt
while it goes in positive x direction it is 1000 kg m/sec and while returning back...it is 2000 kgm/s