Assuming we can ignore the mass and motion of the spring, then we need to conserve momentum
10(3) = 15v
A 10.0 kg cart and a 15 kg cart are locked together with a compressed spring between them. They are then released so that the spring pushes the two carts apart. The 10.0 kg cart is moving at 3.0 m/s afterward. How fast is the 15 kg cart moving
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