If the car was in neutral and its brakes were off, so that the collision is approximately elastic, find the final speed of the truck.

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

How do you tell if someone actually cares about you? and just say they do?

When is a current produced? when the terminals of an electrochemical cell are connected by a wire if the electric circuit is opened in an electrochemical cell if the electrolyte is removed from an electrochemical cell when the electrodes are reversed in an electrochemical cell