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Apply: conservation of momentum calculations

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A 1.0kg cart moving right at 5.0ms on a frictionless track collides with a second cart moving right at 2.0ms. The 1.0kg cart has a final speed of 0.50ms to the right, and the second cart has a final speed of 2.3ms to the right.
What is the mass of the second cart?
Consider rightward as the positive direction.
Round answer to two significant digits.
  • Your answer should be
  • an exact decimal, like 0.75