When a basketball player shoots a ball from his hand at an initial height of 2
meter with an initial upward velocity of 10 meters per second, the height of the
ball can be modelled by quadratic expression -4.9t2 + 10t +2 after t seconds.

a. What will be the height of the ball after 2 seconds?
b. How long will it take the ball to reach the height of 4.5 meter? How long
will it take to touch the ground?
c. Do you think the ball can reach the height of 12 meter? Why? Or Why
not?