Question

A man pushes a wall and fails to displace it.He work done
1.Negative work done
2.Positive but not max.work
3.No work
4.Max.work

Answer 1

Hi fella.....your answer...

Work is done only when the body ln which the force is applied gets displaced in the direction of the force applied...

Here the wall doest not move so 0 displacement

Hence, W=F×0=0

So,

option 3. No work

Answer 2

answer : option (3) No work

explanation : we know, workdone is the dot product of force applied on body and displacement of body due to act of force.

e.g., $W=\vec{F}.\vec{S}$

here, A man pushes a wall but he fails to displace it.

so, displacement of wall , S = 0

Let force applied on wall by the man is F

so, workdone = F × S = F × 0 = 0

hence, there is no workdone on wall by the man.