Question

class 9 lesson 11
see the pic and explain the activity 11.2, 11.3

Answer 1

this is dependent on you that what you do

Answer 2

ACTIVITY 11.2- Consider an engine pulling a train. The engine exerts a force on the train. Work is done on the train and the train starts to move.      ACTIVITY 11.3- suppos, there is a huge rock, we pushed the rock and got exhausted but the rock has not moved. Then we will say no work is done because for work done force and displacement both are required.                               In the sutition in cicular motion, the object in motion is doing no work