Megan rode the bus to school, which is located 8 kilometers from her home. If Megan's frame of reference is her house, and it took her 15 minutes to get home, what was the bus' average velocity during the return trip?

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?

The movement of electrons between atoms is called an