Abasketball is rolling with a velocity of 0.5 meters/second relative to the ground and due north. a tennis ball is rolling with a velocity of 0.25 meters/second relative to ground in the same direction of the basketball. find the velocity of the basketball relative to tennis ball.

Light from two different sources are incident upon the same side of a polarizing filter. light from one source is polarized with total intensity ip, while light from the other source is unpolarized with total intensity iu. as you rotate the polarizing filter through 360 degrees, the intensity of the transmitted light on the other side varies by a factor of 9. what is the relative intensity of the initial polarized source to the unpolarized source, or ip/iu?