Two carts (cart A and cart B) are on a frictionless track. They are held together by a string and havea spring between them which is compressed. When the string is cut the carts will gently 'explode' away from one another as the spring expands. The mass of cart A is 0.2 kg and the mass of cart B is 0.4 kg. After the explosion, cart A has a velocity of −1?/? ?. What is the velocity of cart B at this same time?

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A: Solution