.
They don't; they hit the ground at the same time.
One is more dense than the other.
One is heavier than the other.
Air resistance
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4 seconds
2 seconds
6 seconds
8 seconds
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0 m/s
20 m/s traveling upward
20 m/s traveling downward
40 m/s traveling downward
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20 m/s traveling upward.
10 m/s traveling downward.
20 m/s traveling downward.
30 m/s traveling downward.
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The distance remains constant
The distance increases at a uniform rate
The distance increases at a nonuniform rate
The distance decreases at a uniform rate
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