A 0.50 kg ball traveling at 6.0 m/s collides head-on with a 1.00-kg ball moving in the
opposite direction at a velocity of –12.0 m/s. <br>The 0.50 kg ball moves away at –14 m/s after
the collision. Find the velocity of the second ball.
Let m1 be the mass of the first ball (m1 = 0.5 kg), m2 - the mass of the second ball (m2 = 1 kg). U1, V1 - speeds of the first ball before and after the collision, U2, V2 - speeds of the second ball before and after the collision. According to the law of conservation of linear momentum (let the initial direction of the first ball be positive):