Final answer:
The effort required to lift a load of 40N with a lever is 80N.
Step-by-step explanation:
To calculate the effort required to lift a load using a lever, we can use the formula:
Effort x Effort Arm = Load x Load Arm
Given that the length of the load arm is 6m and the length of the effort arm is 3m, and the load is 40N, we can substitute these values into the formula:
Effort x 3m = 40N x 6m
Effort = (40N x 6m)/3m
= 80N
Therefore, the effort required to lift a load of 40N with a lever is 80N.