- Two billiard balls each of mass 80gm moving in opposite directions with a speed of 36km/hr collide and rebound with the same velocity. Find the change in momentum imparted to each ball due to each other?
Solution :
Change in momentum
=mv- (-mv)
=2mv
=28010ˉ³10
=160010ˉ³
=1.6kgm/sec
- A ball of mass 200gm falls from a height of 5m and rebounds to a height 1.25m.Find the change in momentum and the average force between the ball and the ground if the time during which they are in contact is 0.2sec? g=10m/sec².
Solution :
Velocity on striking the ground, V=√(2gh)
=√(2105)
=10m/sec
Velocity of rebounding V´=√(2gh´)
=√(2101.25)
=5m/sec