4. A ball is thrown upward with an initial velocity of 9.8 m/s from of a building. a. Fill in the table below showing the ball's position, velocity, and accel eration at the end of each of the first 4 s of motion.

Time

(s)

1

2

3

Position

(m)

4.9

0

- 17.7

Velocity (m/s)

0

- 9
- 19

b. In which second does the ball reach the top of its flight?

c. In which second does the ball reach the level of the roof, on the way down?

Acceleration (m/s^ 2 )