Question

In which of the following cases work is said to be done?

• A. A man pushing a roller and displacing it
• B. A boy sleeping
• C. Girl writing in Exam
• D. All of these

Answer 1

The correct option is A A man pushing a roller and displacing it

In the first case, the man is pushing a roller and it is moving so work is said to be done

and in the other two both are sitting they are not moving so no work is said to be done.

$\text{work}=\text{force}\times \text{displacement}$