(a) What is the speed of the four cars after the collision? 2.40 (b) How much me

Question

(a) What is the speed of the four cars after the collision?

2.40

(b) How much mechanical energy is lost in the collision?

I got part (a) but I`m stuck in part (b), please help..
J

A railroad car of mass 2.56 x 104 kg is moving with a speed of 3.84 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 1.92 m/s. (a) What is the speed of the four cars after the collision? 2.40 (b) How much mechanical energy is lost in the collision? I got part (a) but I`m stuck in part (b), please help.. J

Explanation / Answer

Initial KE = 0.5 mv^2

KEi = 0.5* 2.56 e 4 * 3.84 *3.84

KEi = 1.887 e 5 J

KE f = 0.5 * 4* 2.56 e 4 * 2.4 *2.4

KEf = 2.949 e 5 Joules

so

Mech energy lost U = 2.929 -1.887

U = 1.042 *10^5 Joules

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