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. 800 J
C. 8000 J D. 2000 J
Since, Force = Mass * Acceleration
400 = 10m
m = 40
Work done = Mass * Acceleration * Height
= 40 * 10 * 2 = 800 J