Answer:
The force the man applied is 80 N
Explanation:
weight of the load, L = 800 N
distance traveled by the load, a = 10 m
distance traveled by the effort, b = 100 m
Output work = load x distance moved by the load
Output work = 800 x 10 = 8000 J
Input work = Effort x distance moved by effort
Input work = Effort x 100 m
Assuming an ideal machine; no friction effect, the input work will be equal to output work.
Effort x 100 m = 8000 J
Effort = 8000 / 100
Effort = 80 N
Therefore, the force the man applied is 80 N
