What energy does a ski racer have as she crosses the finish line?

What object a collides with object b and bounces back its final momentum is?

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

By what factor does the drag force on a car increase as it goes from 65 to 110 km/h?