56. A 1.00-kg duck flying overhead at 1.50 m/s when

Question :   56. A 1.00-kg duck flying overhead at 1.50 m/s when : 2102127


56. A 1.00-kg duck is flying overhead at 1.50 m/s when a hunter fires straight up. The 0.010 0-kg bullet is moving 100 m/s when it hits the duck and stays lodged in the duck's body. What is the speed of the duck and bullet immediately after the hit?

A. 1.49 m/s

B. 2.48 m/s

C. 1.80 m/s

D. 1.78 m/s

57. Kaitlin uses a bat to hit a thrown baseball. She knocks the ball back in the direction from which it came in a partially inelastic collision. The bat, which is heavier than the baseball, continues to move in the same direction after the hit as Kaitlin "follows through." Is the ball moving faster before or after it was hit?

A. The ball was moving faster before it was hit.

B. The ball was moving faster after it was hit.

C. The ball was moving at essentially the same speed before and after the hit.

D. There is insufficient information to answer this problem.

58. A tennis ball is held above and in contact with a basketball, and then both are simultaneously dropped. The tennis ball bounces off the basketball at a fairly high speed. This is because:

A. the basketball falls farther than the tennis ball.

B. the tennis ball is slightly shielded from the Earth's gravitational pull.

C. the massive basketball transfers momentum to the lighter tennis ball.

D. the tennis ball has a smaller radius.

59. Two skaters, both of mass 75 kg, are on skates on a frictionless ice pond. One skater throws a 0.3-kg ball at 5 m/s to his friend, who catches it and throws it back at 5 m/s. When the first skater has caught the returned ball, what is the velocity of each of the two skaters?

A. 0.02 m/s, moving apart

B. 0.04 m/s, moving apart

C. 0.02 m/s, moving towards each other

D. 0.04 m/s, moving towards each other

60. A 90-kg halfback running north with a speed of 10 m/s is tackled by a 120-kg opponent running south at 4 m/s. The collision is perfectly inelastic. Compute the velocity of the two players just after the tackle.

A. 3 m/s south

B. 2 m/s south

C. 2 m/s north

D. 3 m/s north


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