Two objects of the same mass are in a room. at which of the following distances will the greatest gravitational force be exerted by one object on another? 2 m 4 m 6 m 8 m

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