Train cars are coupled together by being bumped into one another. Suppose two loaded train cars are moving toward one another, the first having a mass of 160,000 kg and a velocity of 0.300 m/s, and the second having a mass of 135,000 kg and a velocity of −0.120 m/s. (The minus indicates direction of motion.) What is their final velocity (in m/s)?
Train cars are coupled together by being bumped into one another. Suppose two loaded train cars are moving toward one another, the first having a mass of 160,000 kg and a velocity of 0.300 m/s, and the second having a mass of 135,000 kg and a velocity of −0.120 m/s. (The minus indicates direction of motion.) What is their final velocity (in m/s)?
College Physics
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Author:Raymond A. Serway, Chris Vuille
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Chapter1: Units, Trigonometry. And Vectors
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Train cars are coupled together by being bumped into one another. Suppose two loaded train cars are moving toward one another, the first having a mass of 160,000 kg and a velocity of 0.300 m/s, and the second having a mass of 135,000 kg and a velocity of
−0.120 m/s.
(The minus indicates direction of motion.) What is their final velocity (in m/s)?
Expert Solution
Step 1
According to Conservation of momentum, the total momentum of a system remains constant.
ptot = p′tot
Then conservation of momentum In the case of the collision between two masses is,
m1u1 + m2u2 = m1v1 + m2v2
where,
ptot = total momentum before the collision
p′tot = total momentum after the collision
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