Who's Faster, Sonic or Flash!?

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

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

What object a collides with object b and bounces back its final momentum is?