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11. A 0,1 kg bouncy ball is dropped. It hits the ground at 8 m.s'. The ball bounces upward with a speed of 6 m.s. a) Calculate the ball's change in momentum. bj Draw a labelled vector diagram to illustrate the initial, final and change in momentum vectors. 12. An 8 g bullet is fired from a rifle. The bullet passes through a 10 cm plank. This reduces the bullet's velocity from 400 m.s' west to 300 m.s' west. a) Calculate the bullet's initial momentum. bj Calculate the bullet's final momentum. () Calculate the bullet's change in momentum. d) Draw a labelled vector diagram to illustrate the bullet's initial, final and change in momentum vectors, 13. Many modern rifles use bullets that have less mass and reach higher speeds than bullets of older rifles, This makes the rifle more accurate over longer distances. The momentum of an old bullet, fired from an old rifle, is 8,25 kg m.s' north. What is the momentum of a new bullet which has = the mass of the old bullet and is fired at ; of the speed of the old rifle? 14. During one part of a model-rocket's lift-off, its momentum increases by a factor of 4 while its mass is halved. The rocket's velocity is initially 8,5 my- upward. What is the rocket's final velodty? 15. In Figure 1.9 a 22 300 kg jet aircraft lands on the deck of an aircraft carrier travelling at 252 km.h-'(70 m.s ) south. It catches one of the arresting cables and is brought to rest over a distance of 100 m. Give the direction of the net force acting on the aircraft. Calculate the aircraft's change in momentum. The pilot of another aircraft, of the Anesting Scune mass, tries to land with the cable same Initial velocity, but misses the arresting cables. The pilot immediately applies full thrust from resting cable is used to catch a landing aircraft. the jet engine and takes off with a speed of 350 km.h. c) Give the direction of the net force acting on the aircraft, d) Calculate the aircraft's change in momentum. 16. During a crash test, car A, of mass in, travels at speed 20, collides with a wall and bounces off the wall at speed v. Car B, of mass 2m, travels at speed , collides with the wall and is brought to rest. Which car experiences the greater change in momentum? Explain your