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Glen has rais...

Question

Glen has raised a dumbbell of mass 5 kg to a height of 10 m above the ground. Calculate the work done by Glen? (Take $g = 10 m s^{- 2}$ )
500

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Solution

The correct option is A 500
Mass, $m = 5 k g$
Displacement, $s = 10 m$
Acceleration due to gravity, $g = 10 m s^{- 2}$

Work done, $W = F o r c e \times d i s p l a c e m e n t$
Force needed to lift the dumbbell is its weight (mg).

$W = F \times s$
$= m g \times s$
$= 5 \times 10 \times 10$
$= 500 J$

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