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Question:

3. A 1000 kg car and a 2000 kg car are hoisted the same distance. Raising the more massive car requires:?

a)less work.b)The same amount of work.c)Twice as much workd)Four times as much worke)More than four times as much work?Justify your answer mathematically.

Answer:

W = F*d W = mg*h (in this case) since linear relationship, it's a direct proportionality.. hence it requires double the work c)
Work done = Force x distance Both are raised same distance, and the Force worked against is the Weight of the car ( = m.g) so answer is (c)

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