2 What is the velocity of a collision if a 3,000 kg train that is moving to the right at 2.5m/s, collides with an empty train of mass 1.500 kg which is moving to the left on the same track at 2.0m/s?
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What is the velocity of a collision if a 3,000 kg train that is moving to the right at 2.5m/s, collides with an empty train of mass 1.500 kg which is moving to the left on the same track at 2.0m/s?
Explanation:
Assuming that the collision is purely inelastic, we can apply conservation of momentum: m c v c + m t v t = ( m t + m c ) u , u = m c v c + m t v t m t + m c = 5000 ⋅ 5.2 + 8000 ⋅ 0 5000 + 8000 = 2 m/s .