Chapter1: The Study Of Motion
Section: Chapter Questions
Problem 6C
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Free-fall Practice Problems
Name
1) A stone is dropped from the top of a cliff. It is seen to hit the ground below after 3.50 s.
How high is the cliff? [60.0 m]
2) Calculate how long it took King Kong to fall straight down from the top of the Empire State
Building (380 m high). What was his velocity just before “landing"? [8.81 s; 86.3 m/s]
3) A car rolls gently (vo = 0) off a vertical cliff. How long does it take to reach a speed of
90 km/hr? [2.6 s]
4) A foul ball is hit straight up into the air with a speed of 25 m/s. (a) How high does it go?
[31.9 m] (b) How long is it in the air, that is, how long does it take to go up and come back
down again? [5.1 s]
5) A ball is thrown vertically downward with a velocity of 15 m/s from the roof of a building
that is 22 m high. How long does it take to hit the ground below? How fast was it going
when in hit? [1.08 s; 25.6 m/s]
6) A ball is thrown vertically upward with a velocity of 15 m/s from the roof of a building that
is 22 m high. How long does it take to hit the ground below? How fast was it going when in
hit? [4.14 s; 25.6 m/s]
7) A ball player catches a ball 3.3 s after throwing it vertically upward. With what speed did he
throw it, and what height did it reach? [16.2 m/s; 13.3 m]
8) A coin is tossed vertically upward and reaches a maximum height of 0.90 m before it comes
back down. With what velocity was it thrown, and how long was it in the air? [4.2 m/s;
0.86 s]
9) The best rebounders in basketball have a vertical leap (that is, the vertical movement of a
fixed point on their body) of about 120 cm.
(a) What is their initial "launch" speed off the ground? [4.85 m/s]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd7f059f1-fdf2-46c1-b796-b5b68043b43c%2Fee8987d5-d18c-48a9-b22f-9529e49bd092%2Fd39gzu5_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Page
> of 2
ZOOM +
Free-fall Practice Problems
Name
1) A stone is dropped from the top of a cliff. It is seen to hit the ground below after 3.50 s.
How high is the cliff? [60.0 m]
2) Calculate how long it took King Kong to fall straight down from the top of the Empire State
Building (380 m high). What was his velocity just before “landing"? [8.81 s; 86.3 m/s]
3) A car rolls gently (vo = 0) off a vertical cliff. How long does it take to reach a speed of
90 km/hr? [2.6 s]
4) A foul ball is hit straight up into the air with a speed of 25 m/s. (a) How high does it go?
[31.9 m] (b) How long is it in the air, that is, how long does it take to go up and come back
down again? [5.1 s]
5) A ball is thrown vertically downward with a velocity of 15 m/s from the roof of a building
that is 22 m high. How long does it take to hit the ground below? How fast was it going
when in hit? [1.08 s; 25.6 m/s]
6) A ball is thrown vertically upward with a velocity of 15 m/s from the roof of a building that
is 22 m high. How long does it take to hit the ground below? How fast was it going when in
hit? [4.14 s; 25.6 m/s]
7) A ball player catches a ball 3.3 s after throwing it vertically upward. With what speed did he
throw it, and what height did it reach? [16.2 m/s; 13.3 m]
8) A coin is tossed vertically upward and reaches a maximum height of 0.90 m before it comes
back down. With what velocity was it thrown, and how long was it in the air? [4.2 m/s;
0.86 s]
9) The best rebounders in basketball have a vertical leap (that is, the vertical movement of a
fixed point on their body) of about 120 cm.
(a) What is their initial "launch" speed off the ground? [4.85 m/s]
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