-110 m's 8.5 Kg other away with 90.0 kg, and Kesh 12.0g a. Sketch the even Figure 20 situations, and 69. Football A 95-kg fullback, running at 8.2 m/s, b. Find the ratio collides in midair with a 128-kg defensive tackle their hands los moving in the opposite direction. Both players end c. Which skater h up with zero speed. d. Which skater p a. Identify the before and after situations, and draw a diagram of both. 75. Billiards A cue ba b. What was the fullback's momentum before the 4.0 m/s, hits a st collision? If the cue ball tra c. What was the change in the fullback's momentum? path and the eigh direction, as sho d. What was the change in the defensive tackle's of each ball afte momentum? e. What was the defensive tackle's original momentum? 1. How fast was the defensive tackle moving originally? 70. Marble C, with mass 5.0 g. moves at a speed of 20.0 cm/s. It collides with a second marble, D. with mass 10.0 g. moving at 10.0 cm/s in the same direc- tion. After the collision, marble C continues with a speed of 8.0 cm/s in the same direction. a. Sketch the situation, and identify the system. Identify the before and after situations, and set up a coordinate system. b. Calculate the marbles' momentums before the collision. C. Calculate the momentum of marble C after the Figure 21 collision. d. Calculate the momentum of marble D after the collision. 76. A 2575-kg van compact car at e. What is the speed of marble D after the collision? 8.5 m/s. Assun is negligible, c 258 Chapter 9 . AssessmentChapter Sell-Check 17. A 0.200-kg pla e this problem so that it can 71. Two lab carts are pushed together with a spring tion of momentum: mechanism compressed between them. Upon bej 0.30 m/s. It co mass 0.100 kg is at the ice-skating rink. . ." released, the 5.0-kg cart repels with a velocity of 0.12 m/s in one direction, while the 2.0-kg cart go at a speed of In the opposite direction. What is the velocity of the continue mo The speed of 2.0-kg cartf the new vel avels at a forward velocity mary 8,5-kg concrete block 72. A 50.0-g projectile is launched with a horizona surface, and ricochets in the velocity of 647 mys from a 4.65-kg launcher moving in the same direction at 2.00 m/s. What is the Applying a velocity of -110 m/s, as fast will the concrete block launcher's velocity after the launch? 78. Explain uh 73. Skateboarding Kofi, with mass 42.00 kg. is riding . rather the skateboard with a mass of 2.00 kg and traveling at 19. An object 1.20 m/s. Kofi jumps off, and the skateboard stops describe dead in its tracks. In what direction and with what object's velocity did he jump? 8.5 kg 74. In-line Skating Diego and Keshia are on in-line skates. They stand face-to-face and then push each other away with their hands. Diego has a mass of 90.0 kg, and Keshia has a mass of 60.0 kg a. Sketch the event, identifying the before and after Force (N) k, running at 8.2 m/s, situations, and set up a coordinate axis. 128-kg defensive tackle b. Find the ratio of the skaters' velocities just after direction. Both players end their hands lose contact. c. Which skater has the greater speed? Figur d after situations, and draw d. Which skater pushed harder? 80. Is k's momentum before the 75. Billiards A cue ball, with mass 0.16 kg, rolling at 4.0 m/s, hits a stationary eight ball of similar mass fr If the cue ball travels 45" to the left of its original E in the fullback's momentum? path and the eight ball travels 45' in the opposite 81. F in the defensive tackle's direction, as shown in Figure 21, what is the velocity of each ball after the collision? e tackle's original isive tackle moving originally? g. moves at a speed of th a second marble, D, with 10.0 cm/s in the same direc- marble C continues