2. 1D Motion / Kinematics
Vertical Motion and Free Fall
2. 1D Motion / Kinematics
Vertical Motion and Free Fall
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A rock is thrown vertically upward with a speed of 27.0 m/s from the roof of a 31.0-m-tall building. The rock doesn't hit the building on its way back down and lands in the street below. (a) What is the speed of the rock just before it hits the street? (b) How much time elapses from when the rock is thrown until it hits the street?
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A student throws a set of keys vertically upward to her sorority sister who is in a window 14.00 m above. The second student catches the keys 1.50 s later. (a) With what initial velocity were the keys thrown? (b) What was the velocity of the keys just before they were caught?
3877views71rank9comments - Scelta multiplaA steel ball is dropped onto a thick piece of foam. The ball is released 2.0 meters above the foam. The foam compresses as the ball comes to rest. How fast is the ball moving when it first hits the foam? Ignore air resistance.2059views
- Scelta multiplaA steel ball is dropped onto a thick piece of foam. The ball is released 2.5 meters above the foam. The foam compresses as the ball comes to rest. What is the magnitude of the ball's acceleration as it comes to rest on the foam? Ignore air resistance.2043views