Someone in a car going past you at the speed of 24 m/s drops a small rock from a height of 2.4 m. how far from the point of the drop will the rock hit the ground? the acceleration due to gravity is 9.8 m/s^2. answer in units of m.

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.