A tiny ball (mass = 0.012 kg) carries a charge of -15C. What is the electric field magnitude that would cause the ball to float above the ground? (chp18,p39)

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