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    Linear Momentum

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    "Find the speed at which Superman (mass = 89.0 g) must fly head-on into a train (mass = 16405 kg) traveling at 75.0 km/hr to stop it."

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    The concept which we must understand is that initial momentum of the system before collision is equal to the final momentum of the system after collision.

    <br>That is m1*v1 + m2*v2 = m1*v3 + ...