Question

A boy of mass 40 kg climbs 30 steps is 50 sec.The height of each steps is 10 cm.Find the work done

Answer 1

Given mass of the boy = 40 kg

Also given height of each step = 10 cm = 0.1 m

Therefore height of 30 steps = 30*0.1 = 3 m

Work done by the boy = mass * gravity *height

                                      = 40*10*3

                                      = 1200 J