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Physics Past Paper Question on Efficiency

The question below to me doesn't make sense, the answer to this question is C but why does the useful output = gravitational potential energy, and the total input = work done?
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(edited 8 months ago)
Reply 1
Efficiency questions can depend on what the expected purpose is.

Sliding some object up a ramp (aka inclined plane) is a way of increasing the gpe (height) of the object when you wouldnt be able to lift it straight upwards.
Reply 2
Original post by Joinedup
Efficiency questions can depend on what the expected purpose is.

Sliding some object up a ramp (aka inclined plane) is a way of increasing the gpe (height) of the object when you wouldnt be able to lift it straight upwards.

Thank you!

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