Ball A has mass 5 kg and starts out to the left of Ball B, which has mass 1 kg. Ball A starts moving at 1 m/s towards the stationary Ball B. There is a wall to the right of Ball B, so Ball B bounces against the wall and then against Ball A several times. Describe each collision between the two balls: how many collisions are there, and how fast is each ball moving after the collision? (Note: there is no wall to the left of Ball A, so it is free to fly away as far as it wants to the left. Also, assume all collisions with the wall are perfect, meaning the ball simply comes back with the same velocity.)

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