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  4. A body of mass 1 kg is thrown upwards with a velocity 20 m/s. It momentarily comes to rest after attaining a height of 18 m. How much energy is lost due to air friction? (g = 10 m/s2)

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

AIPMTAIPMT 2009Work, Energy and Power

Solution:

Loss of energy $=\frac{1}{2} mv ^{2}- mgh =20\, J$