Question

A car of mass 1500kg travelling at a velocity of 10 m/s crashes into the back of a moving car of mass 1500kg travelling at a velocity of 5 m/s. The vehicles move together after the impact Calculate their velocity?​

Answer 1

M1 V1 + M2 V2 = (M1 + M2) V

Conservation of momentum where V is speed of combined vehicles

V = (1500 * 10 + 1500 * 5) / (1500 + 1500) = 7.5 m/s