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A mason worker throws the bricks to a height of 10m, at which the bricks reach with a velocity of 6m/s. The percentage of energy he is wasting is nearly (g = 10 $m s^{- 2}$ )

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15%

18%

220%

36%

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detailed solution

Correct option is A

Energy wasted by the mason = $\frac{1}{2} m u^{2}$

Fraction of energy wasted

$\frac{\frac{1}{2} m u^{2}}{m g h + \frac{1}{2} m u^{2}} \times 100 = \frac{u^{2}}{(2 g h + u^{2})} \times 100$

= $\frac{36}{200 + 36} \times 100 = \frac{36}{236} \times 100 = 15 %$

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A mason worker throws the bricks to a height of 10m, at which the bricks reach with a velocity of 6m/s. The percentage of energy he is wasting is nearly (g = 10ms-2)

Unlock the full solution & master the concept.

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free study material

A mason worker throws the bricks to a height of 10m, at which the bricks reach with a velocity of 6m/s. The percentage of energy he is wasting is nearly (g = 10 $m s^{- 2}$ )