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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?
J
t the vertices of a square are located four identical positive point charges. what is the charge on one of the positive point charges
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A 66.0 kg person throwsa 0.0400 kg snowball forwardwith a ground speed of 32.0 m/s. A second person, with a massof 59.0 kg, catches thesnowball. Both people are on skates. The first person is initiallymoving forward with a speed of2.00 m/s, and th..
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