Answer: The output force is 80 N.
Explanation :
It is given that,
Mechanical advantage of a machine is 4
Input force is 20 N
We know that the ratio of output force to the input force gives the mechanical advantage of a machine.
\(m=\dfrac{F'}{F}\)
Where
F' is the output force
F is the input force
\(F'=20\ N\times 4\)
F' = 80 N
So, magnitude of output force is 80 N.
