a boy runs from his house to school at speed 5m/s on a straight road and returns with speed of 10m/s. The distance between the house and school is 100m. Find his average velocity with explaination please

Which is not a source of noise pollution? a)airplanes b)acid rain c)machines d)cars

Uppose we consider the system of the three capacitors as a single "equivalent" capacitor. given the charges of the three individual capacitors calculated in the previous part, find the total charge qtot for this equivalent capacitor. express your answer in terms of v and c.

The diagram shows a boulder rolling down a hill into a valley and then up the opposite hill. at which position does the boulder have the greatest kinetic energy? a b c d