A 50,000-kg train car moving at 2 m/s collides and connects to another identical car initially at rest. –What is the momentum of the first train car before the collision?

–What is the final velocity of the two connected train cars?

-Is the momentum being conserved through out the collision? Explain why.

-Is the kinetic energy being conserved through out the collision? Explain why.

-Is this collision an elastic or inelastic collision? Explain why.

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.