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Theoretical Verification of Law of Conservation

A body of mas...

Question

A body of mass 1 kg of thrown upwards with a velocity 20 m/s. It momentarily comes to rest after attaining a height of 18m. How much energy is lost due to air friction ?
$(g = 10 m / s^{2})$

10 J

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20 J

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30 J

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40 J

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Solution

The correct option is B 20 J
Loss of energy= $\frac{1}{2} m v^{2} - m g h = 20 J$

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