Amachine had a mechanical advantage of 4.5 what force is out out by the machine if the force applied to the machine is 800n

a. 0.006n
b. 180n
c. 805n
d. 3600n

D. 3600 N

Mechanical advantage is the ratio of force output from a machine divided by the force input into the machine.

That is;

Mechanical advantage = Output Force/Input Force

In this case;

Input force = 800 N

Thus;  Output force = M. A × input force

                                 = 4.5 × 800

                                 = 3600 N

Therefore; the output force by the machine is 3600 N

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.