A tennis player throws a tennis ball straight up with an initial speed of 7.80 m/s. Assume that the acceleration of the ball after it leaves her hands is downward at 9.80 m/s2.

(a) How long does it take to reach its maximum height?

(b) How far above her hands is the ball when it is at maximum height?

(c) At what times is the ball at a height of 0.80 m above her hands? There are two
answers.