10. A spring is compressed between two objects with unequal masses, m and M, and

Question

10. A spring is compressed between two objects with unequal masses, m and M, and held together. The objects are initially at rest on a horizontal frictionless surface. When released, which of the following is true? (A) The total final kinetic energy is the same as before being released. (B) The total final kinetic energy is zero. (C) The two objects have equal kinetic energies. (D) The speed of one object is equal to the speed of the other. (E) The total final momentum of the two objects is zero. PROBLEMS. Show your working equation, solution, and final answer with units. No credit may be given for a correct answer with no work shown. Five points each. 1. Refer to the graph which shows the force acting on a 5 kg mass A. What is the total impulse? B. What is its final velocity over the 8.0 s period? 2. A boy hits a 0.05-kg golf ball, giving it a speed of 75 m/sec. A. What impulse did he deliver to the ball? B. If the duration of impact is 0.01 seconds, what was the average force of impact? A loaded freight car A with a mass of 24,000 kg moves at a constant velocity of 8 m/s on a horizontal railroad track and collides with an empty stationary car B with a mass of 8,000 kg. After the collision the cars stick to each other and moves like one object. A. What is the velocity of two cars after the collision? 3. B. How much energy is "lost"?

Explanation / Answer

2A] impulse given = mv = 0.05*75 = 3.75 kg m/s

B] Force = impulse/time = 3.75/0.01 = 375 N answer

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