Question

when is the work done in the following situations
1. A boy pushing a wall
2. A girl carrying a school bag on her shoulders
3. A stone falling freely
4.A boy climbing up the stairs ​

Answer 1

Answer:

1. A boy pushing a wall

Explanation:

Because when work is done if a person tends force and covers displacement at inclination of an angle theta.

i.e. Workdone = Force × Displacement × Cos theta

That's why a boy pushing a wall makes an angle theta.