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I would just like to know how to do the calculation to get answer C ?
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Remember that velocity is a vector so both magnitude and direction matter.

So, lets say the downwards direction is negative, tht means that the magnitude and direction of the ball when falling is $-1v$ and $0.75v$ when going upwards.

The mass $m$ is constant.

Becusae the upward and dowward directions are opposites, it means that to get the change in momentum we subtract the two, so:

$(0.75v \times m) - (-1v \times m)$

which yields $1.75mv$ upwards.
by Diamond (78,454 points)

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