Q. A 40-kg shell is fired from a gun with a muzzle velocity 60 m/s at 39o above the horizontal. At the top of the trajectory, the shell explodes into two fragments of equal mass. One fragment, whose speed immediately after the explosion is zero, falls vertically. What is the horizontal speed of the other fragment?

Q. Light with a wavelength of 618 nm passes through a slit 7.52 wide and falls on a screen 1.88 m away. Calculate the linear distance on the screen from the central bright fringe to the first bright fringe above it.