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AP Physics 1 - Collision Practice 1. A 70.0-kg ice hockey goalie, originally at rest, catches a 0.150-kg hockey puck slapped at him at a velocity of 35.0 m/s. Suppose the goalie and the ice puck have an elastic collision and the puck is reflected back in the direction from which it came. What would their final velocities be in this case? 2. During an ice show, a 60.0-kg skater with a velocity of 4.00 m/s leaps into the air and is caught by a stationary 75.0-kg skater. a. What is their final velocity? b. How much kinetic energy is lost? 3. Two manned satellites approach one another at a relative speed of 0.250 m/s, intending to dock. The first has a mass of 4000 kg, and the second a mass of 7500 kg. If the two satellites collide elastically rather than dock, what is their final relative velocity? 4. A 30,000-kg freight car is coasting at 0.850 m/s with negligible friction under a hopper that dumps 110,000 kg of scrap metal into it. a. What is the final velocity of the loaded freight car? b. How much kinetic energy is lost