A ball weighing 3 kg moves horizontally at a speed of 2 m / s and hits a ball weighing 4 kg, after

A ball weighing 3 kg moves horizontally at a speed of 2 m / s and hits a ball weighing 4 kg, after which it stops. How fast will the second ball move?

According to the law of conservation of momentum, the speed and mass of the balls will be related by the relations:

m1 * v1 = m2 * v2;

Let’s find the speed of the second ball after the collision:

v2 = (m1 * v1) / m2 = (3 * 2) / 4 = 1.5 m / s.

Answer: The second ball after the collision will move at a speed of 1.5 m / s.