Numerical Questions 3,4 and 5|Collisions| Force and Motion| KP, Federal

3.3) A car moving at 20 m/s crashes into a tree. Find the magnitude of the average force acting on a passenger of mass 70 kg in each of the following cases. (a) The passenger is not wearing a seat belt. He is brought to rest by a collision with the wind-shield and dashboard that last 2 ms. (b) The car is equipped with the passenger-side air bag. The force due to the air bag acts for 45 ms, bringing the passenger to rest. 3.4) A 0.4 kg ball travelling with the speed of 15 m/s strikes a rigid wall and rebounds elastically. If the ball is in contact with the wall for 0.045 s (a) what is the momentum important to the wall and (b) the average force exerted on the wall ? 3.5) One ball of mass 0.600 kg travelling 9.00 m/s to the right collides head on elasticly with a second ball of mass 0.300 kg travelling 8.00 m/s to the left. After the collision what are the velocities?