Hello! My name is Zalgo and I shall be helping you out on this mystical day~! The answer that you are looking for is... "In physics, a force is said to do work if, when acting, there is a displacement of the point of application in the direction of the force. It is calculated by the formula W = f x d. Therefore, we calculate the problem above as follows:
W = f x d
4000 = f x 20
f = 200 N"
I hope this answer helps! :P
"Stay Brainly and stay proud!" - Zalgo
(By the way, can you give me Brainliest? I'd greatly appreciate it, Thank you! X3)