10.A ball is thrown upward from a height of 40 m and then falls to the ground. The
relation of its height to time can be written as h(t) = -5t² + 10t + 40, where h
represent the height of the ball above the ground in metres and t represents the
time in seconds.
a. How many seconds does it take the ball to reach the ground?
b. What is the maximum height of the ball?
c. At what time(s) will the ball be at a height of 43.75 m?