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Work Done by Force of Gravity

A 20 kg box...

Question

A $20 k g$ box is to be lifted $1 m$ onto the back of a lorry, straight up using a $5 m$ long ramp. Calculate the work done.

A

2 J

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B

20 J

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C

200 J

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D

10 J

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Solution

The correct option is C $200 J$
Work done $= m g h = 20 \times 10 \times 1 = 200 J$
$(g = 10) (F = m g)$

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