A ball thrown straight upward from a height of 6 ft with an initial velocity of 55 ft per sec has height h(t) feet after t seconds,
where h(t)=-16t+55t+6. What is the ball's average velocity (that is, its average rate of change in height) during the
first second?
The average velocity during the first second is
(Type an integer or a simplified fraction.)
feet per second