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Q.

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)

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a

18%

b

15%

c

220%

d

36%

answer is A.

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Detailed Solution

Energy wasted by the mason = 12mu2

Fraction of energy wasted

 12mu2mgh+12mu2×100=u22gh+u2×100

=36200+36×100=36236×100=15%

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