Answers

2014-08-21T00:25:04+05:30

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
There is a force acting on the boy = m g
                       where g is called acceleration due to gravity.

Work done by the boy against the force of gravity is given by the product of Force and distance traveled (vertically) or, height climbed.

Work done = m g h
In order to do this work, the boy spends some of his internal energy.

2) Work done to bring the boy to the height h is same = m g h.
   This work is done by the motor running the lift. The boy gains from it.


2 4 2