How does the law of conservation of energy apply to machines?

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

The speed of light can be used to measure the

Atriangle with equal sides of length 10 cm has -2.5-nc charged objects at each corner. part a determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. horizontally rightward vertically downward vertically upward horizontally leftward