A boy weighing $400 N$ climbs a vertical ladder. If the value of $g$ be $10 m s^{- 2}$ , the work done by him after climbing $2 m$ will be :

200 J

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800 J

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8000 J

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16000 J

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Solution

The correct option is B $800 J$
Weight of the boy $m g = 400 N$
Height upto which the boy climbs $h = 2 m$
Thus work done by him against the gravity $W = (m g) h$
$∴$ $W = 400 \times 2 = 800 J$

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A boy weighing 400N climbs a vertical ladder. If the value of g be 10ms−2 , the work done by him after climbing 2m will be :

The correct option is B 800JWeight of the boy mg=400NHeight upto which the boy climbs h=2mThus work done by him against the gravity W=(mg)h∴ W=400×2=800J

A boy weighing $400 N$ climbs a vertical ladder. If the value of $g$ be $10 m s^{- 2}$ , the work done by him after climbing $2 m$ will be :

The correct option is B $800 J$
Weight of the boy $m g = 400 N$
Height upto which the boy climbs $h = 2 m$
Thus work done by him against the gravity $W = (m g) h$
$∴$ $W = 400 \times 2 = 800 J$