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Question

A 100 kg block is dropped from the top of a building 80 m tall. Assume g=10 ms2. Find the work done by the force of gravity as it falls vertically to hit the ground.


A
80000 J
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B
80000 J
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C
20000 J
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D
0 J
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Solution

The correct option is C 80000 J
We know that,
Workdone, W=F.s

F=mg=100×10=1000 N;  s=80 m
W=FScosθ, as it is falling vertically the force of gravity is along the direction of displacement (cos0o=1)

W=FScos0=FS=1000×80=80000 J

Hence option A is the correct answer

Physics

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