8. A 50. kg cart is moving across a frictionless oor at 2.0 m/s. A 70. kg boy, riding in the cart, jumps off so that he hits the oor with zero velocity. a)Draw a before and after velocity-mass bar graph for this situation, and determine any unknown variables. Before After (b) Which has a greater change in velocity, the cart of the boy? Explain why your answer makes sense by referring to laws of physics. (0) Which has a greater change in momentum, the cart or the boy? Explain why your answer makes sense by referring to laws of physics. '3". Kim has a mass of 48kg and holds a 2.0 kg air rie loosely and res a bullet of mass 1.0 g. The velocity ofthe bullet is 150 mfs. Before After (a)Draw a before and after velocity-mass bar graph for this situation, and determine the recoil speed of the gun. (b) which has the greater change in velocity, the gun or the bullet? Explain why y0ur answer makes sense by referring to laws of physics. (c) Which has the greater change in momentum, the gun or the bullet? Explain why your answer makes sense by referring to laws of physics. Kim res again, but this time she holds the gun tightly against her body. (d)Draw a before and after velocity-mass bar graph for this situation, and determine the recoil speed of the gun. Before After (e) In which case is recoil speed of the gun less? Explain. 5. A tennis player's 1.0kg racket is moving with a velocity of 32m/s when it impacts a tennis ball traveling at 30. m/s from the opponent's serve. The 0.20kg ball is hit straight back at 25. m/s. (a)Draw a before and after velocity-mass bar graph for this situation, and determine any unknown variables. Before After (b) Which object had the greater change in velocity, the racket or the ball? Explain why your answer makes sense by referring to laws of physics. (c) Which object had the greater change in momentum, the racket or the ball? Explain why your answer makes sense by referring to laws of physics. 6. Mighty Miguel has a mass of 100. kg and is running towards the end zone at 5.0 rn/s. Joey Gonzales (mass of 75.0 kg) runs at 7.0 m/s towards Miguel. When they collide at the 2- yard line, Joey grabs Miguel with velcrolike strength and holds on. (a)Draw a before and after velocity-mass bar graph for this situation, and determine any unknown variables. Before After (b) Does Miguel score? Explain. (e) Which player had the greater change in velocity, Miguel or Joey? Explain why your answer makes sense by referring to laws of physics. (d) Which player had the greater change in momentum? Explain why your answer makes sense by referring to laws of physics