A girl on a runs down a hill 400 meters. Then the girl runs up the hill 50 meters and falls down. The entire trip lasted 50 seconds. What is the average velocity of the girl? SHOW your work including equation used, work and answer with units.

Achild throws a ball with an initial speed of 8.00 m/s at an angle of 40.0° above the horizontal. the ball leaves her hand 1.00 m above the ground. how long is the ball in flight before it hits the ground?

In a series circuit the __ is the same at every point

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