A man raises 1 kg wt. to a height of 100 cm and holds it there for 30 minutes. How much work has he performed?

1 \times 9.8 J

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1 \times 9.8 \times 30 \times 60 J

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1 \times 9.8 \times 30 J

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1 \times 9.8 \times 30 e r g

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Solution

The correct option is A $1 \times 9.8 J$
Given
$m = 1 k g h = 100 c m = 1 m t = 30 m i t$

Work dont $W =$ Force $\cdot$ Displacement
Force apply to lift the mass = Weight of the body= $1 \times 9.8$ N
From above equation,
$W = 1 \times 9.8 \times 1 J$
$W = 1 \times 9.8 J$
Option A

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