A machine has an efficiency of 60%. If the machine is required to overcome a load of 30N with a force of 20N. Calculate its mechanical advantage.
A
1.5
B
0.9
C
0.7
D
2.5
Verified Correct Answer: A.
Step-by-Step Mathematical Solution
E = 60%, L = 30N, E = 20N
M.A = \(\frac{\text{L}}{\text{E}}\) = \(\frac{30}{20}\) = 1.5
Source: WAEC / JAMB / NECO Classroom Archive (Record #76337)