# Math Help - simple cal question

1. ## simple cal question

If a ball is thrown vertically upward from the roof of 64 foot building with a velocity of 96 ft/sec, its height after t seconds is s(t)=64+96t–16t2. What is the maximum height the ball reaches?

What is the velocity of the ball when it hits the ground (height 0)?

2. if $s(t)$ is the height of the ball with respect to time then find $s'(t) = 0$