You drive along on a straight road at 20 m/s. The light in front of you turns red and you brake with a constant acceleration. You come to a stop after traveling a distance of 15 meter. Assume you started out driving in the positive direction. a. What is the acceleration of the car?
b. How much time did it take to comes to a stop?

Ultraviolet radiation is dangerous because it has a high enough energy to damage skin cells. what is the best explanation of the relationship between wavelength and wave energy? a) wave energy is related only to frequency, not wavelength. b) longer wavelengths have lower frequencies but higher energy. c) the shorter the wavelength, the lower the frequency and the higher the energy. d) the shorter the wavelength, the higher the frequency and the higher the energy.