Step-by-step explanation:

its 1/4 of the circle
circle circumference:

we need 1/4 of it, so its

Answer:
2
Step-by-step explanation:
when it returns to the ground , h = 0
32t -16t2 = 0 and solve for t
t = 0, 2 ....0 is the start, 2 is when it returns
I say the answer is point c from the way the points are on the graph