A man pushes a wall and fails to displace it. He does
No work at all
Explanation for the correct option:
Option (C): No work at all
Work = Force x Displacement
As man fails to displace the wall, displacement of the wall is zero. [Applied force is not zero]
So, the work done will be zero.
Explanation of the incorrect options:
Option (A): Negative work
When the direction of applied force and displacement are in opposite direction.
Example- work done against gravity, frictional work etc.
Option (B): Positive but not maximum work
When the direction of applied force and displacement are in the same direction.
Example- pushing chair, kicking football etc.
Option (D): Maximum work
Direction of applied force and displacement are in same direction and angle between them is zero.
Hence, Option (C) is correct.