Ball A, which has a mass of 4.2 kg, is dropped from the 31 floor of a building.

Question

Ball A, which has a mass of 4.2 kg, is dropped from the 31 floor of a building. At the same time, ball B, which has a mass of 2.9 kg, is dropped from the 22 floor of the same building. Ignoring air resistance, which of the following statements is true? [Enter all correct answers eg. A or AC or ABC or ...]

A) Ball A always has a lesser speed than ball B
B) The distance between the balls stays the same
C) The balls have the same acceleration
D) Ball A reaches the ground after ball B
E) None of the above

Explanation / Answer

A: False, the two experience an equal acceleration, and will have the same speed as long as they are falling.
B: True, until the bottom ball hits the ground.
C: True, both balls experience the acceleration of gravity equally.
D: True, since they both travel at the same speed, the ball that starts closer to the ground (Ball B) will hit the ground first.
E: False, there are some true ones.

B, C, D

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