Question

A railroad car moving at a speed of 3.50 m/s overtakes, collides and couples with two coupled railroad cars moving in the same direction at 1.40 m/s. All cars have a mass of mass 3.3x10^4 kg.

(a) Determine the speed of the three coupled cars after the collision. (Give your answer to at least 2 decimal places.) m/s

(b) Determine the kinetic energy lost in the collision. J

Answer 1

Mass of railroad car ,m=3.3*10⁴kg

initial velocity of railroad car =3.5m/s

(a)Consider Conservation of Momentum

ANSWER:

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(b)Kinetic energy loast in collision =Initial Kinetic energy -Final Kinetic Energy

ANSWER: =

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