a truck with a mass of 5000 kg and a velocity of 15.0 m/s collides head-on with a car whose mass is 1000 kg, moving at 30.0 m/s. if the two vehicles move together after the impact, at what velocity do they move?

Answer 1

M1*V1 + M2*V2 = M1*V + M2*V.
5000*15 + 1000*(-30) = 5000V + 1000V.
V = ?.