1) If a rock is dropped from the top of a tall building, how fast will it be going after 3.0 seconds? 5) From the top of a cliff, a ball is thrown downward with a velocity of -15 m/s, how far down will it have gone after 2.5 seconds? 6) How fast will a falling ball be going after 2.5 seconds, if it has an initial velocity of -15 m/s?

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.