The height h in feet reached by a golf ball after t seconds is given by h(t)=-16t squared+120t, After how many seconds does the golf ball strike the ground?

Answer 1

-16t^2 + 120t = 0
Use Quadratic Formula and get:
Tr = 3.75 s. = Rise time or time to reach max ht.

Tf = Tr = 3.75 s. = Fall time.

T = Tr + Tf = 3.75 + 3.75 = 7.50 s. To
strike gnd.