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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."© BrainMass Inc. brainmass.com March 6, 2023, 1:15 pm ad1c9bdddf
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 + ...