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A water rocket is launched off the ground at an initial velocity of 20 feet per second. Which of the following can be used to model the flight of the water rocket?
a.h(t)=-16t^{2}+20t+20
b.h(t)= 16t^2+20t
c.h(t)=-16t^2+20
d.h(t)=-16t^2+20t+40