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Assume momentum is conserved in this case. Cart A of unknown mass is moving on a...

Assume momentum is conserved in this case. Cart A of unknown mass is moving on a friction balanced track with a speed 0.422m/s. It then collides with cart B of mass 0.42kg which is at rest, becoming stuck together with a speed 0.24m/s. What is the mass of cart A in (kg) after collision?

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