Math Algebra
posted by Kat on .
Here the missing Infos ;)).
The Physics of Baseball by Robert Adair 
after t seconds, starting 1 sec after 35 angle, rotating with an initial backspin of 2000 revolutions per minute, and hit about 110mph is given by
H(t)= 80t^2+340t260 (in feet)
a)how many seconds willpass before the ball hits the ground?
The distance travelded by the ball is given by
D(t)= 5t^2+115t110 (in feet)
b)How far will the ball travel before it hits the ground?
c)Using D(t), how far will a ball travel in 6 seconds, the time it takes it takes a high fly ball to hin the ground?

a) just plug in H=0 and solve for t
t = 1, 13/4
b) just plug in t = 13/4
D(3.25) = 210.9
c) D(6) = 400 ft