A ball is thrown vertically upwards. Determine the work done by gravity when the ball travels upto a height of 15m. Mass of the ball =1kg. Acceleration due to gravity (g)=10m/s2.
A
150J
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B
100J
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C
−150J
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D
Zero
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Solution
The correct option is C−150J 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=15m