and a head-on collision a 2,250 kg car moving North with the speed of 22 m/s strikes to 3,800 km truck moving south at a unknown speed after the collision both vehicles bounce back in the opposite direction from which they were originally moving if the car bounces South with a speed of 28 m/s and the truck bounces North with the speed of 8 m/s how fast must the truck have been moving before the collision