Starting to use functions help

[Miraclefruit]

Write a program to provide information on the height of a ball thrown straight up into the air. The program should request as input the initial height, h feet, and the initial velocity, v feet per second. The height of the ball after t seconds is h + vt - 16t2 feet. The program should perform the following two calculations:
(a) Determine the maximum height of the ball. Note: The ball will reach its maximum
height after v/32 seconds.
(b) Determine approximately when the ball will hit the ground. Hint: Calculate the
height after every .1 second and determine when the height is no longer a positive
number


I'm getting errors for my main and the ballTime functions. This is what I have so  far:

def main():
    h = 0
    v = 0
    getInput(h, v)



def getInput(h, v):
    h = eval(input("Enter the initial height of the ball: "))
    v = eval(input("Enter the initial velocity of the ball: "))
    isValid(h,v)

def isValid(h,v):
    if ((h<= 0) or (v <= 0)):
        print("Please enter positive values")
        getInput(h,v)

    else:
        maxHeight(h,v)
    

def maxHeight(h,v):
    t = (v/32)
    maxH = (h + (v*h) - (16*t*t))
    print("The maximum height of the ball is", maxH, "feet.")
    ballTime(h,v)


def ballTime(h,v):
    
    ballHeight = (h + (v*t) - (16*t*t))
    while (ballHeight >= 0):
        t += 0.1

    print("The ball will hit the ground after approximately", t, "seconds.")

main()

Any help is appreciated, thanks!