Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?

thermal energy
electric energy
potential energy
internal energy

A1,700kg car is being used to give a 1,400kg car a push start by exerting a force of 140n the impulse on the smaller car during the 30.0s of contact is +670kg*m/s. what is the impulse of the smaller car on the larger car? -814 kg*m/s 0kg *m/s -670kg*m/s -550kg*m/s

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?

What does the law of conservation of mass state?