Constant Acceleration and Free Fall Review

A free falling objects falls under the influence of 

• force of air
• force of gravity
• force of resistance
• force of 

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Do free falling objects move at constant velocity or do they accelerate?

• Falling objects accelerate at -9.8 m/s²
• Falling object move at constant velocity
• Falling objects accelerate at 100 m/s²
• It depends on the mass: heavy objects accelerate, light objects do not

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What values are always known for an object that is dropped?

• v_i = 0 m/s

  a = -9.8 m/s²

• v_i = -9.8 m/s

  a = -9.8 m/s²

• v_i = -9.8 m/s

  a = 0 m/s²

• d = -9.8 m

  v_i = 0 m/s

A free falling object falls for 2.4 s. What is its displacement? Use equation #3

• -28.2 m

• -11.76 m

• -56.45 m

• -9.8 m

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

• -15.68 m/s
• - 9.8 m/s
• - 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

• 28.5

• 19.8

• 9.8

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An apple falls out of a tree and takes 1.75 seconds to strike the ground. How high was the apple from the ground?

• 25.00

• 20.00

• 15.00

• 10.00

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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?

• 9.8

• 93.1

• 98.1

• 9.3

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A plane is flying a 9000 m when one bolt works its way loose and falls to the ground. How long did it take to hit the ground?

• 55.0

• 49.2

• 45.9

• 42.9

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