You use a lever to lift a heavy tree branch. you apply a force of 50 n and the lever lifts the branch with a force of 90 n. what is the mechanical advantage of the lever?

1.8

Explanation:

Mechanical advantage is given by the ratio of the load lifted to the force applied to lift the load

In this case Mechanical advantage=L/E where L is the load and E is the effort applied

Mechanical advantage= 90/50 =1.8

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )

it has to be b, about 97 percent.