a duck has a mass of 2.90kg. as the duck paddles, a force of 0.250 N in a direction of 55.0° south of east. When these forces begin to act, the velocity of the duck is 0.150 m/s in a direction due east. Find (a) the magnitude and (b) the direction (relative to die east) of the displacement that the duck undergoes in 2.10 s while the forces are acting. (Note that the angle will be negative in the south of east direction.)

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?