Arailroad car of mass 2.50 3 104 kg is moving with a speed of 4.00 m/s. it collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same direction with an initial speed of 2.00 m/s. (a) what is the speed of the four cars after the collision? (b) how much mechanical energy is lost in the collision?

2.5 m/s

37.5KJ

Explanation:

Let be the initial velocity of rail road car ,coupled cars & Final velocity of system respectively.

Conserving momentum

Therefore Final velocity of system is 2.5m/s

(b)Mechanical Energy lost =Initial Kinetic Energy -Final Kinetic Energy

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