Question Detail
Question
A 2 kg ball moving at 3 m/s collides with a 4 kg ball that is stationary. If the collision is perfectly inelastic, what is the speed of the 2 kg ball after the collision in m/s?
Correct Answer
Option B is the correct answer.
Detailed Explanation
In perfectly inelastic collision, masses stick together. Conservation of momentum: m₁u₁ + m₂u₂ = (m₁+m₂)v. So 2×3 + 4×0 = (2+4)v → 6 = 6v → v = 1 m/s. Both move together at 1 m/s, so the 2 kg ball speed is 1 m/s.
Hint
Momentum conserved, final velocity same for both.