Answer:
Part a)

Part b)

Explanation:
Part a)
Since the diver is moving under gravity
so here its acceleration due to gravity will be uniform throughout the motion
so here we will have

here we have




Part b)
at highest point of his motion the final speed will be zero
so we will have



Answer:toward the ceiling
Explanation:
if you use the right hand rule it will point to the ceiling
Because people do not like being told what to do.
After the foot leaves the ball, the acceleration is always downward and is equal to g at all points