Question

Please answer this physics question im desperate!! 30 POINTS AND BRAINLIEST!!

Answer 1

Answer:

I have an answer,

Explanation:

for (a)

wall does not displace so the nett work done is zero

for (B)

he is not moving in accordance to his surrounding so nett work done is zero.

for(C)

the skier does not move, his skie moves so he doesn't do any nett work.

hope this helps