A 10 kg rock, initially at rest, explodes into two fragments. A 4 kg fragment flies due East at 10 m/s. What is the velocity of the second fragment?

I NEED HELP ASAP

While standing outdoors one evening, you are exposed to the following four types of electromagnetic radiation: yellow light from a sodium street lamp, radio waves from an am radio station, radio waves from an fm radio station, and microwaves from an antenna of a communications system. rank these type of waves in terms of increasing photon energy.