A lever with an effort arm of 10 meters and a load arm of 2 meters is used to lift an object weighing 220 Newtons to a height of 4 meters. If 400Joules of work is done, how much force must have been applied?
A. 100 N
B. 4000 N
C. 1600 N
D. 800N
To solve this problem, we can use the concept of work done.
The work done is given by the formula: Work = Force x Distance.
In this case, we are given that the work done is 400 Joules, the distance is 4 meters, and we need to find the force.
We can rearrange the formula to solve for Force:
Force = Work / Distance.
Force = 400 Joules / 4 meters.
Force = 100 Newtons.
Therefore, the force that must have been applied is 100 Newtons.
So, the correct answer is A. 100 N.