Question

In this question,it is written that no external force is applied,if it is written that 2N force is applied so what will be its solution

Answer 1

there is no external force is applied ok
if u want to solve it then u think about the situation of 40kg girl ok
it is a hint
then u solve it

Answer 2

It is said that no unbalanced force is acting to mean that there no force like air or any other force like friction.

the solution continues as it is given in the book