A body of mass 1 kg is thrown upwards wi...

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

30 J

40 J

10 J

20 J

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Verified by Experts

The correct Answer is:

When a body thrown upwards , its kinetic energy converted into potential energy and energy lost due to friction is equal to th difference between kinetic and potential energy .
` :. " Energy lost " = K - V `
` = 1/2 mv^(2) -mgh`
` = 1/2 xx 1xx 400 - 1 xx 10 xx 18`
` = 200 - 180 = 20 J `

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