A bus can reach a length of 30 m long with two trailers and they have a total mass of 28 × 103 kg. Imagine a safety test with one of these buses and a truck with a mass of 12 × 103 kg. The truck with an unknown speed hits a bus that is at rest so that the two vehicles travel together with a speed of 3.0 m / s. Calculate the speed of the truck before the collision.

A bus can reach a length of 30 m long with two trailers and they have a total mass of 28 × 103 kg. Imagine a safety test with one of these buses and a truck with a mass of 12 × 103 kg. The truck with an unknown speed hits a bus that is at rest so that the two vehicles travel together with a speed of 3.0 m / s. Calculate the speed of the truck before the collision.