Aball is thrown horizontally from a high cliff with a velocity of 5 m/s. ignoring the slowing of the ball due to air resistance (and assuming the ball is still falling), what will be the horizontal velocity of the ball 3 seconds later? a. 0 m/s b. 5 m/s c. 9.8 m/s d. 15 m/s

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?