Question

A truck with a mass of 2.00 × 103 kilograms is traveling at +19.0 meters/second along a road. It hits a stationary sedan with a mass 9.90 × 102 kilograms. If the truck and the sedan stick together after the collision, what is the final velocity of the two together?

Answer 1

This one's easy

The final velocity of the truck and the sedan together is +7.19 m/s. This can be calculated using the law of conservation of momentum: m1v1 + m2v2 = (m1+m2)vf, where m1 and m2 are the masses of the truck and the sedan respectively, v1 is the velocity of the truck, v2 is the velocity of the sedan (which is 0 in this case) and vf is the final velocity of the truck and the sedan together.