If a student knows a ship traveled 300 meters straight north at 10 km/h, what else does the student know?
a. velocity
b. acceleration
c. average acceleration
d. instantaneous speed

Why does lightning travel from clouds to the ground?

Name two kinds of practical electric pumps.

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up