Click on the diagram that shows a first class lever

In first class type of levers the load and reaction must be on opposite side of the fulcrum

So in this type of system fulcrum is always at the mid position of load and applied force

So here we can see that first figure is satisfying the situation of first class lever

So correct answer will be

FIRST FIGURE

answer: i'm not sure which is which for i get confused on it all the time but i can tell you that the answer lies with the convex and concave devices. i hope this you. have a good day and best of luck to you!

explanation: