Question

A. Alhouse is thrown straight upward off a high building. The building is located somewhere on the surface of Earth. 4 seconds later, the mouse hits the ground. ASSUME: • The building is an unknown height. • The mouse takes 4 seconds to reach the ground. • The mouse's initial speed is 5 m/s DETERMINE: • The height of the building. 6 pts) B. Near the surface of Earth, a helicopter travels upward at a constant velocity. At some moment, t-o, a package is thrown out of the helicopter. The package is given a downward velocity relative to the helicopter. The helicopter continues to move up at the same constant velocity. ASSUME: • The helicopter has a v. of 50 m/s upward relative to the earth. • The package has a v, of 20 m/s downward relative to the helicopter. DETERMINE: After 7 seconds have elapsed (from t=0), the amount in meters by which the helicopter and package separated. 6 pts) C. At t = 0, a street hockey stick slaps a puck, giving the puck an unknown initial horizontal velocity, V. The street surface underneath the puck is rough, so the hockey puck loses speed at every instant of its motion -- from the very first to the very last. The puck slows down at a constant rate: Every second, the puck loses the same amount of speed. ASSUME: • It takes 0.51 s for the puck to come fully to rest • From t-o to t=0.51, the puck travels 1.275 m DETERMINE: The magnitude and direction of a, the constant acceleration for this puck. (5 pts)

Answer 1

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