Freefall and Calculations

A free falling object falls for 1.6 s. What is the final speed?

• 15.68 m/s

• 9.8 m/s²

• 6.125 m/s

• 25.088 m/s

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The acceleration due to gravity near the surface of Earth is equal to

• 9.8 m/s

• 9.8 kg x m/s

• 9.8 N

• 9.8 m/s²

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How fast will a brick be going after it falls for 2.5 seconds?

• 24.5 m/s

• 28.5 m/s

• 19.8 m/s

• .26 m/s

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A rock is thrown out of a volcano. When it started to fall, it took 9.5 seconds to hit the ground. How fast was the rock traveling as it struck the ground?

• 0.97 m/s

• 93.1 m/s

• 98.1 m/s

• 9.8 m/s²

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If an object weighs 67 N on Earth, what is the mass of the object?

• 67 kg

• 6.8 kg

• 656.6 kg

• 0.14 kg

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A penny is dropped from the top of the Eiffel Tower. It takes 5 seconds for it to hit the ground. What is it's final speed?

• 1.96 m/s

• 9.8 m/s²

• 49 m/s

• 0.51 m/s

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A ball is dropped from a cliff on Earth. Its final speed was 50 m/s. How long did it take for the ball to hit the ground?

• 5.1 s

• 490 s

• .196 s

• 9.8 m/s²

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A bowling ball and a tennis ball are dropped from a height of 37 meters. Which one will hit the ground first, if air resistance is ignored?

• not enough information given

• bowling ball

• both will hit the ground at the same time

• tennis ball

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On object falls to Earth. It takes 480 s for it to hit the surface of the Earth. What is the rate of acceleration of the objects falling to Earth after 100 s?

• 980 m/s

• 9.8 m/s²

• 4,704 m/s

• 10.2 m/s

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Which best describes why a falling object will reach its terminal velocity?

• Gravity force is equal and opposite air resistance force.

• Air resistance force is equal and opposite the freefall velocity.

• Gravity force is equal and opposite the object's mass.

• The object's mass is equal and opposite the gravity force.

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