2. 1D Motion / Kinematics

Vertical Motion and Free Fall

2. 1D Motion / Kinematics

# Vertical Motion and Free Fall - Video Tutorials & Practice Problems

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## Vertical Motion & Free Fall

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Problem

ProblemA 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

3

Problem

ProblemA 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?

A

(a) v

(b) v

_{0y}=37.5 m/s(b) v

_{y}=22.8 m/sB

(a) v

(b) v

_{0y}=16.7 m/s(b) v

_{y}=2 m/sC

(a) v

(b) v

_{0y}=2 m/s(b) v

_{y}=0 m/s## Do you want more practice?

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PRACTICE PROBLEMS AND ACTIVITIES (63)

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