Two objects were lifted by a machine. one object had a mass of 2 kilograms, was lifted at a speed of 2m/sec . the other had a mass of 4 kilograms and was lifted at 3m/sec. which object had more kinetic energy while it was being lifted? show all calculations

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?