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A body of mass `1 kg` is thrown upwards with a velocity `20 ms^(-1)`. It momentarily comes to rest after attaining a height of `18 m`. How much energy

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A body of mass `1 kg` is thrown upwards with a velocity `20 ms^(-1)`. It momentarily comes to rest after attaining a height of `18 m`. How much energy is lost due to air friction? `(g = 10 ms^(-2))`
A. 10J
B. 20J
C. 30J
D. 40J
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1 Answer

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Correct Answer - B
Loss of energy `=(1)/(2)mv^(2)-mgh=20J`
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