If a horse does 4000j of work over 20m how much force does the horse use

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

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b) phosphorus pentoxide