Answer:
2 is the mechanical advantage of the machine.
Explanation:
Mechanical advantage of a machine is defined as ratio of force exerted by the machine to the force exerted on the machine.
\(\phi =\frac{\text{Resistance force}}{\text{Effort Force}}=\frac{F_r}{F_e}\)
Resistance force,\(F_r\) = 40 N
Effort force, \(F_e\) = 20 N
\(\phi =\frac{40 N}{20 N}=2\)
2 is the mechanical advantage of the machine.
