You push a 2.1 kg object on a table with 42 N of force. You are in contact with the box for 0.10 seconds. Ignoring friction, how fast is the box moving when you stop pushing?

Hydrogen and helium are both members of?

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

This energy transformation diagram represents the energy of a skateboarder moving along a half-pipe. as she skates toward the top of the half-pipe, her original kinetic energy is converted to potential energy and friction. how much of the energy is potential?