Question

In the following cases, state whether bwork is done or not, justify your answer. 1) A student reads a book. 2) The revolution of the earth around the sun

Answer 1

on first work is not done but on second The revolution of the earth around the sun in this question work is done

Answer 2

in first case work is not done...
but in 2nd case it is said to be done because,
work is said to be done when a force applied on an object causes displacement of the object.....
hope it helps...