Which statement best describes why a machine is useful?

a-a machine does a greater amount of work than the amount of work that is done on it.
b-a machine does a smaller amount of work than the amount of work that is done on it.
c-a machine can decrease both the input force and the input distance needed to do a given amount of work.
d-a machine can decrease either the input force or the input distance needed to do a given amount of work.

It is D) A machine can decrease either the input force or the input distance needed to do a given amount of work, cause I just took the quiz. Good luck on finishing the course!

D-A machine can decrease either the input force or the input distance needed to do a given amount of work.

dec 23, 2016 - a load of bricks weighing 680 n a distance of 10 m across a parking lot. if if the worker pushes the cart with a constant force of 209 n, what work= force x distance = 220 n x 10 m = 2200 n.m = 2200 j i don't know where the person got it from, but the initial part, work= force x distance me.