Two objects inside an evacuated container, one with a mass three times the other one, are dropped from the same height. If they are dropped at the same time, which of the following is true? a) The acceleration of the heavier object is three times greater than that of the lighter object. b) The acceleration of the lighter object is three times less than that of the heavier object. c) They will both hit the ground with the same speed. d) Anything falling in vacuum experiences no friction and thus has constant velocity. e) The force of gravity is the same for both objects.

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.