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Percy pulls on a rope that is held up by a pulley, like the one shown. The pulley is near the ceiling, and the other end of the rope is attached to a crate. Percy applies 75 N of force to the rope, and the rope lifts the crate by applying a force of 75 N.

What is the mechanical advantage of the machine?
a. 0
b. 1
c. 150
d. 5625

Respuesta :

Krogalos
Mechanical advantage is the ratio of force applied to the force output, so the answer is B because for each Newton of force applied one is outputted the pulley just changes the direction of the force. 
justindion2020

B............................................................

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