Q. Two automobiles, each of mass 900 kg, are moving at the same speed, 15 m/s, when they have an inelastic collision.(a) In what direction and at what speed does the wreckage move if one car was driving north and one south? (b) In what direction and at what speed does the wreckage move if one car was driving north and one east?
Q. a helium-neon laser emits light of wavelength 633 nanometers. Light from an argon laser has a wavelength of 515 nm. Which laser emits the higher frequency?