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Posted by **Alyson** on Monday, October 3, 2011 at 11:16pm.

(i) What is its initial height? __________ ft.

(ii) What is its maximum height? ___________ ft.

(iii) How long does it take to reach the ground? __________ sec.

- Math -
**Steve**, Tuesday, October 4, 2011 at 10:43aminitial height is when t=0. 448

h = -16(tē - 3t - 28)

= -16(t-7)(t+4)

Note that h=0 when t=7. That's the answer to part iii

Since the two roots are -4 & 7, the apex is reached at t = (-4 + 7)/2 = 1.5

h(1.5) = -16(5.5)(5.5) = 484 ft

- Math -
**jaja**, Tuesday, October 15, 2013 at 6:48pm-16t^2+48t+864

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