If a ball is thrown vertically upward from the roof of a 64 foot building with a velocity of 80 ft/s, it's height after t sexonds is s(t)=64+80t-16t^2. What is the maximum height the ball reaches? What is the velocity of the ball when it hits the ground?

A body is thrown straight up with initial velocity 5 feet per second from a height of 40 feet. After how many seconds will it hit the ground? What will be its maximum height?