Ball is tossed straight up from edge of the 47 foot high building, with the initial upward velocity of 20 feet/second. Its height in feet after t seconds is
h(t)=-16t2+20t+47.
Reply the questions given, write units in the answers.
How long before ball hits ground (h(t)=0)?
Find out how long before it reaches its maximum height?
How high will it go?