A particle starts out from the origin with velocity 10ms^-1 and continues moving at the velocity for 5s. The velocity is then abruptly reversed to -5ms^-1 and the object moves at the velocity for 10s. For this motion find a. The change in position, i. e. displacement
B. the total distance travelled
C. Average speed
D. Average velocity

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.