Question

A car A1 of mass 30kg moving with a velocity of 2N/s hit another car A2 of mass 50kg moving in the same direction with car A1. If the common velocity of the two cars as they hit each other was 3N/s. Find the velocity of car A2.

Answer 1

$$m_1v_1+m_2v_2=(m_1+m_2)v$$

$$30(2)+50v_2=(30+50)3$$

$$v_2=3.6\frac{m}{s}$$