What is the mass of a train car if it was moving at 4 m/s tothe West before coll

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What is the mass of a train car if it was moving at 4 m/s tothe West before colliding and connecting with a 1300 kg train carthat was moving at 6 m/s to the East before the collision. Afterthe collision, the two cars move together at 3 m/s to the East.
if i can ask another..... A 20 kg bowling ball (lets call it Ball A) is moving to theright at 15 m/s when it collides and bounces off a 5 kg bowlingball (lets call this one Ball B) that is at 18 m/s to the left.What is the velocites of the two balls after the collision? What is the mass of a train car if it was moving at 4 m/s tothe West before colliding and connecting with a 1300 kg train carthat was moving at 6 m/s to the East before the collision. Afterthe collision, the two cars move together at 3 m/s to the East.
if i can ask another..... A 20 kg bowling ball (lets call it Ball A) is moving to theright at 15 m/s when it collides and bounces off a 5 kg bowlingball (lets call this one Ball B) that is at 18 m/s to the left.What is the velocites of the two balls after the collision?

Explanation / Answer

help please!

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