2. 1D Motion / Kinematics
Vertical Motion and Free Fall
Multiple Choice
Multiple ChoiceA 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?
A
(a) vy = 36.6 m/s downward;
(b) t = 3.88 s
(b) t = 3.88 s
B
(a) vy = 11.0 m/s downward;
(b) t = 3.88 s
(b) t = 3.88 s
C
(a) vy = 37.0 m/s downward;
(b) t = 34.2 s
(b) t = 34.2 s
D
(a) vy = 36.6 m/s downward;
(b) t = 6.49 s
(b) t = 6.49 s
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