HELP MULTIPLE CHOICE QUESTION

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

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.

Use the periodic table to determine how many grams of oxygen would be required to react completely with 859.0 g c2h2