Light is passed through a double slit experiment and viewed on a screen 3 metres away producing the idealized two slit pattern. a) someone then knocks the slits so that one slit is closer to the screen by a distance dx

You throw a ball upward and let it fall to the ground. your friend drops an identical ball straight down to the ground from the same height. is the change in kinetic energy (from just after the ball is released until just before it hits the ground) of your ball greater than, less than, or equal to the change in kinetic energy of your friend's ball?