Joe wants to toss a ball up to his friend Kate who is standing on the roof of a 75 foot high building. He tosses the ball upward with an initial velocity of40feet per secondand releases it at a height of4 feetabove the ground.

*If the ball does not reach roof level, experiment with the value for the initial velocity to find the minimal initial velocity where the ball will rise to that level. (Round your answer to the nearest whole number. If an answer does not exist, enter DNE.)