Balls A (1 kg) and B (2 kg) move at 21 m s⁻¹ and 4 m s⁻¹ in opposite directions and collide head-on. After collision A moves at 1 m s⁻¹ in the same direction. Which statements are correct?
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Question

Balls A (1 kg) and B (2 kg) move at 21 m s⁻¹ and 4 m s⁻¹ in opposite directions and collide head-on. After collision A moves at 1 m s⁻¹ in the same direction. Which statements are correct?

G1 Physics · Accepted Answer

Use conservation of linear momentum together with e = (relative speed of separation)/(relative speed of approach). Solving the two collision equations gives A: Velocity of B after collision is 6 m s⁻¹ opposite to its initial direction.; B: Coefficient of restitution is 0.2.; C: Loss of kinetic energy is 200 J..