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Which of the following statements about the work done by gravity is correct?


Gravity always does more work on a ball that rolls down a steep hill than it does on a ball that rolls down a more gradual hill.


When an object falls, the amount of work done by gravity depends on how much air resistance affects the object.


If two objects slide down to the bottom of a ramp from the same height, gravity always does more work on the more massive object, regardless of the effects of friction.


A falling object will always acquire a greater velocity when gravity has done more work on it.

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