Answer Happy

1. If we examine a ball in free fall, we find that both the momentum and the kinetic energy of the ball increase. However, the A. total energy of the ball (potential plus kinetic) is conserved. B. momentum of the ball plus momentum of the earth is conserved. C. kinetic energy of the ball is not conserved. D. All of the above .. 2. Which of the following objects has the largest kinetic energy? A mass of with a speed of A. 8 kg ... 2 m/s B. b. 8 kg ... 3 m/s *** C. 6 kg ... 2 m/s D. 6 kg ... 3 m/s to the 3. A ball moving at 4 m/s toward the right has a head-on collision with an identical stationary ball. Each of the following possibilities satisfies the law of conservation of linear momentum. Which one also conserves kinetic energy? One ball has a velocity of while the other has a velocity of right. A. 2 m/s to the right ... 2 m/s B. zero ... 4 m/s *** C. 2 m/s to the left ... 6 m/s D. 4 m/s to the left ... 8 m/s Chap 6 work energy energy 4. Which of the following is NOT a unit of energy? A. joule B. newton-meter C. kilowatt-hour D. watt *** 5. A person carries a 50N bowling ball so that the ball is moving horizontally at constant velocity. How much work is the person doing on the ball, for each meter that the ball is carried? A. O J*** B. 50 J C. 100 J D. 500 J E. 1,000 F. 5,000 J G. none of the above choices are correct