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A ball of mass falls vertically downwards to the floor. If the speed of the ball, just before it hits the floor, is and it rebounds from the floor with a speed of , what is its change in momentum?
downwards
upwards
downwards
upwards
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falls vertically downwards to the floor. If the speed of the ball, just before it hits the floor, is 
and it rebounds from the floor with a speed of 
, what is its change in momentum?
downwards
downwards
upwards. (Option D)
