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A railroad car of mass 3.1 104 kg moving at 4.00 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m/s.
(a) What is the speed of the three coupled cars after the collision?
(b) How much kinetic energy is lost in the collision?
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A hydrogen atom at rest makes a transition from the n=8 state to n=3. Find the wavelength of the emitted photon
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