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2, Jennifer hits a stationary 0.20-kg ball, and it leaves her racket at 40 m/s. Time-lapse photography shows that the ball was in contact with the racket for 40 ms. (3) What average force did the ball exert on the racket? (b) What is the ratio of this force to the weight of the ball? i I U FontFamin 'AA' A .0 ._"5 '55 v cD y El I, ll 4 2f @ 4. A 60-kg swimmer suddenly dives horizontally from a 150-kg raft with a speed of 1.5 m/s. The raft is initially at rest. What is the speed of the raft immediately after the diver jumps if the water has negligible effect on the raft? Bi U Font Family AA A6. A batter applies an average force of 8000 N to a baseball for 1.1 ms. What is the magnitude of the impulse delivered to the baseball by the bat? B i U Font Family 7. A 0.17-kg baseball is thrown with a speed of 38 m/s and it is hit straight back toward the pitcher with a speed of 62 m/s. What is the magnitude of the impulse exerted upon the ball by the bat? B U Font Family AAA DE EE.D D 9. Find the magnitude and direction of the net momentum of the system shown in the gure. Express the direction by giving the angle the net momentum makes with the +x -axis. 15. A batter hits a 0.140-kg baseball that was approaching him at 30 m/s and, as a result, the ball leaves the bat at 40 m/s in the reverse of its original direction. The ball remains in contact with the bat for 2.0 ms. What is the magnitude of the average force exerted by the bat on the ball? B U Font Family 16. What is the magnitude of the momentum of a 0.140 kg baseball traveling at 45.0 m/s? i U Font Family 17. An empty train car of mass 2.0 x 10 * kg coasts along at 10 m/s. A 3000-kg boulder is suddenly dropped vertically into the car. Find the speed of the car immediately after the boulder is dropped in. B i U Font Family19. A 14,000-kg boxcar is coasting at 1.50 m/s along a horizontal track when it suddenly hits and couples with a stationary 10,000-kg boxcar. What is the speed of the cars just after the collision? B i U Font Family 20. A 475-gram ball is traveling horizontally at 12.0 m/s to the left when it is suddenly struck horizontally by a bat, causing it to reverse direction and initially travel at 8.50 m/s to the right. If the bat produced an average force of 1275 N on the ball, for how long (in milliseconds) was it in contact with the ball? B i U Font Family AVA DE E E . @ 60