6. a 1500 kg car drifts along a level road and slows down from 35 m/s to 25 m/s in 20
seconds. what is the net force acting on the car? what is causing this force?

Using the work energy theorem. what is the velocity of a 850kg car after starting at rest when 13,000j of work is done to it.

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.

What are similarities and differences between refraction, reflection, diffraction and absorption?