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Question

A ball is thrown vertically upwards. Determine the work done by gravity when the ball travels upto a height of 15 m. Mass of the ball =1 kg. Acceleration due to gravity (g) =10 m/s2.

A
150 J
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B
100 J
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C
150 J
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D
Zero
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Solution

The correct option is C 150 J
We know that work done by gravity (Wg) is given by
Wg=F.S, here force due to gravity is its weight mg and displacement is given as, S=15 m

Hence workdone will be

Wg=mg s cos 180=1×10×15
Wg=150J

Hence option C is the correct answer

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