how is the process of finding the mass of a gas different from that of finding the mass of a liquid why is the difference necessary

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

The law of the conservation of momentum says that the total momentum of any closed and isolated system cannot

Mechanical energy is when the amount of kinetic and potential energies added together remains the same. conserved created lost