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A ball dropped from rest falls freely until it hits the ground with a speed of 20 meters per second. The time during which the ball is in free fall is approximately
2 s
44.1 m
44 m
120 m
one half as great
78.3 m
20 m/s
7.4 m/s
A rock falls from rest off a high cliff. How far has the rock fallen when its speed is 39.2 meters per second? Neglect friction.
2 s
44.1 m
44 m
120 m
one half as great
78.3 m
20 m/s
7.4 m/s
A 5.0-kilogram sphere, starting from rest, falls freely 22 meters in 3.0 seconds near the surface of a planet. Compared to the acceleration due to gravity near Earth's surface, the acceleration due to gravity near the surface of the planet is approxi
2 s
44.1 m
44 m
120 m
one half as great
78.3 m
20 m/s
7.4 m/s
A softball is thrown straight up, reaching a maximum height of 20 meters. Neglecting air resistance, what is the ball's approximate vertical speed when it hits the ground?
2 s
44.1 m
44 m
120 m
one half as great
78.3 m
20 m/s
7.4 m/s
A ball is thrown vertically upward with an initial velocity of 29.4 meters per second. What is the maximum height reached by the ball? Neglect friction.
2 s
44.1 m
44 m
120 m
one half as great
78.3 m
20 m/s
7.4 m/s
After a model rocket reached its maximum height, it then took 5.0 seconds to return to the launch site. What is the approximate maximum height reached by the rocket? Neglect air resistance.
2 s
44.1 m
44 m
120 m
one half as great
78.3 m
20 m/s
7.4 m/s
A ball is thrown straight downward with a speed of 0.50 meter per second from a height of 4.0 meters. What is the speed of the ball 0.70 second after it is released? Neglect friction.
2 s
44.1 m
44 m
120 m
one half as great
78.3 m
20 m/s
7.4 m/s
How far will a brick starting from rest fall freely in 3.0 seconds?
2 s
44.1 m
44 m
120 m
one half as great
78.3 m
20 m/s
7.4 m/s
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