If I was traveling 76 mph on the highway, how many ly/s am I going?

Based on the law of conservation of energy, which statement is false? answer- energy is lost when machines dont work right

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

What energy conversion occurs when a sling shot is used to shoot a rock across the room? (2 points) question 2 options: 1) stored mechanical energy is converted to mechanical energy. 2) stored mechanical energy is converted to radiant energy. 3) gravitational energy is converted to radiant energy. 4) gravitational energy is converted to mechanical energy.