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Question

A girl weighing 400 N climbs a vertical ladder. If the value of g be 10 m s2, the work done by her after climbing 2 m will be:

(a) 200 J

(b) 800 J

(c) 8000 J

(d) 2000 J


Solution

F = 400 N

g = 10 m s2

F = m × g

m = Fg = 40010 = 40

W = F × d
W = mg × 2
    = 40 × 10 × 2 = 800 J

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