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A girl weighing 400 N climbs a vertical ladder. If the value of g be 10 m s-²,the work done by her after climbing 2 m will be : a) 200 J b) 800J c) 8000J d) 2000J correct answer is (B).Can you explain this answer?
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A girl weighing 400 N climbs a vertical ladder. If the value of g be 1...
Calculation of Work Done

Given:

Weight of the girl, W = 400 N

Value of acceleration due to gravity, g = 10 m/s²

Height climbed by the girl, h = 2 m

Formula:

Work done, W = Force × Displacement × Cosθ

where, θ is the angle between the force and displacement vectors

In this case, θ = 0° as the force and displacement are in the same direction

Calculation:

Force exerted by the girl, F = Weight = 400 N

Displacement of the girl, s = h = 2 m

Cosθ = Cos0° = 1

Therefore, Work done, W = F × s × Cosθ = 400 N × 2 m × 1 = 800 J

Answer:

The work done by the girl after climbing 2 m is 800 J. Hence, option (B) is correct.
Community Answer
A girl weighing 400 N climbs a vertical ladder. If the value of g be 1...
W(weight )=mg
400N=m*10
so m will be 40 kg
then as we know W=fs
W=mgh
W=40*10*2
so W=800joules..... ANSWER..
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A girl weighing 400 N climbs a vertical ladder. If the value of g be 10 m s-²,the work done by her after climbing 2 m will be : a) 200 J b) 800J c) 8000J d) 2000J correct answer is (B).Can you explain this answer?
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