Answer:
75%
Explanation:
I assume the effort is 200 N, not 2000.
The load is 20 cm from the fulcrum, and the crowbar is 1 m long, so the effort is applied 80 cm from the fulcrum. So the theoretical load that can be raised is:
20 cm × F = 80 cm × 200 N
F = 800 N
But the actual load is 600 N. So the efficiency is:
e = 600 N / 800 N
e = 0.75
The efficiency of the crowbar is 75%.
