a 7,800 kg truck runs into the rear of a 1,000 kg car traveling at 2.5 m/s. The truck and the car are locked together after the collision and move with 4.5 m/s. What was the initial speed of the truck?

A 1,120-kg car traveling initially with a speed of 25.0 m/s in an easterly direction crashes into the rear end of a 9,100-kg truck moving in the same direction at 20.0 m/s (see figure below). The velocity of the car right after the collision is 18.0 m/s to the east. +25.0 m/s +18.0 m/s +20.0 m/s After Q (a) What is the velocity of the truck right after the collision? (Round your answer to at least three decimal places.) x m/s (east) Before (b) How much mechanical energy is lost in the collision? x) Account for this loss in energy

In the railroad freight yard, an empty freight car of mass m rolls along a straight level track at 1.20 m/s and collides with an initially stationary, fully loaded boxcar of mass 5.80m. The two cars couple together on collision.   a.)What is the speed of the two cars after the collision? b.)Suppose instead that the two cars are at rest after the collision. With what speed was the loaded boxcar moving before the collision if the empty one was moving at 1.20 m/s?

A 2,670 kg truck jumps the median and clobbers a 630 kg station wagon in a head-on collision. You are tasked with determining the truck’s initial speed for insurance purposes. An observer states that the station wagon was traveling at a speed of 25.1 m/s and that after the collision, the two vehicles stuck together and were moving at a speed of 23.2 m/s in the direction the truck was originally moving. What was the truck’s original speed?