A railroad car of mass 2.50x10^4 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?
o figure out the answer you do part over whole equals percent over one hundred and when you fill those in you get x over 350 equals 70 over 100 then you cross multiply to get x times 100 equals 70 times 350 now you have 100x = 24500 now you divide both sides by 100 to get 245 as your answer