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Q.

A girl weighing 400 N climbs a vertical ladder. If the value of g be 10 ms-2, what wiil be the work done by her after climbing 2 m ?


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a

200 J

b

800 J

c

8000 J

d

2000 J 

answer is B.

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Detailed Solution

The work done will be 800 J.
Given that,
Force F = 400 N,
acceleration due to gravity g = 10 ms-2,
distance s = 2 m
We know the equation of work done as,
 ⇒W=F × s
Here, W, F, and s represents work done, force and displacement respectively.
Thus, work done is
 ⇒W=F × s  ⇒ W = 400 × 2 ⇒W = 800 J
 
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