Evaluate how much work did the actor do

Reference no: EM13565952

Four railroad cars, each of mass3.00 x 104 kg, are coupled together and coastingalong horizontal tracks at speed vi toward thesouth. A very strong but foolish movie actor riding on the secondcar uncouples the front car and gives it a big push, increasing itsspeed to 4.40 m/s south. The remainingthree cars continue moving south, now at 2.25 m/s.

(a) Find the initial speed of the cars.

m/s

(b) How much work did the actor do?

Reference no: EM13565952

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