A baseball is thrown upward at 20 m/s. It takes 15.5 s before the baseball strikes the ground. Neglect air resistance.

a. How high above the ground was the baseball when it was thrown?
b. What is the velocity of the baseball just before it hits the ground?

vf= 4 m/s
d= 4 m

Explanation:
It is given that the initial velocity is 0 m/s, the acceleration is 2 m/s^s, and the time is 2 seconds. To find final velocity, use the kinematics equation vf=vi+at.
final velocity=0+(2*2)=4 m/s
For distance, use the kinematics equation vf^2=vi^2+2ad.
4^2=0^2+(2*2*d)
16=4d
distance=4 meters.