A construction worker uses a board and log as a lever to lift a heavy rock. If the input arm is 5 meters long and the output arm is 2 meters long, what is the mechanical advantage of the lever?
a
7
b
0.4
c
10
d
2.5
The mechanical advantage of the lever can be calculated by dividing the length of the input arm by the length of the output arm.
So, mechanical advantage = input arm length/output arm length = 5/2 = 2.5
Therefore, the answer is d) 2.5.