A man tries hard to push a loaded truck but fails to move it. In tis case he does

A man continues to push a rock for some time but fails to moe it. What is the work done? Explain?

A man pushes against a wall but fails to move it .He does:

Seema tried to push a heavy rock of 100 kg for 200s but could not move it. Find the work done by Seema at the end of 200s.

A man pushes a wall and fails to displace it.He does

Why does a loaded truck start more slowly than an empty truck?