Suppose a ball is thrown up straight into the air, and the height of the ball above the ground is given by the function h(t)=6+37t-16t^2, where h is in feet and t is in seconds. a) What is the veloci

Suppose a ball is thrown up straight into the air, and the height of the ball above the ground is given by the function h(t)=6+37t-16t^2, where h is in feet and t is in seconds.

a) What is the velocity of the ball at time t=3.2

b) At what time t does the ball stop going up and start returning to earth?