physics momentim questions

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  1.  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

  1. 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

Join now!

                            Change in momentum =mv- (-mv´)

                                                              =mv+mv´

                                                              =m(v+v´)

                                  ...

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