A body of mass 5 kg is thrown vertically upwards so that it reaches a maximum height of 50 m in 20 seconds. Find the power required to throw the ball so that it reaches that height. $(t a k e g = 10 m s^{- 2})$

250 watts

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125 watts

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300 watts

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50 watts

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Solution

The correct option is B
125 watts

For a ball which is thrown upwards, the work done(W) is equal to change in potential energy
Given, chaanhe in height, h = 50 m
or, W = mgh=50 $\times$ 5 $\times$ 10 = 2500 J.
So, power = $\frac{W o r k d o n e}{t i m e t a k e n}$ = $\frac{2500}{20}$ = 125 watts.

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