h = –16t squared + 60t + 9.
h = 700.
How long will it take the object to hit the ground? Round your answer to the nearest thousandth.
2006-10-27 19:20:49 · 3 answers · asked by phatlane1 1 in Science & Mathematics ➔ Mathematics
solving the quadratic equation 700= –16t squared + 60t + 9.
16t squared - 60t - 9.= -700
16t squared - 60t - 9+700=0
16t squared - 60t+691=0
solve the corresponding eqn.
x=1.875
; t=1.875
2006-10-27 19:31:27 · answer #1 · answered by tomzy 2 · 0⤊ 0⤋
h = –16t^2 + 60t + 9 = 700
16t^2 - 60t - 691 = 0
t = (60 ± â(3600 + 44224))/32
t = (60 ± â47824)/32
t = (60 ± 218.68699)/32
t = 8.709 sec.
2006-10-28 02:40:44 · answer #2 · answered by Helmut 7 · 0⤊ 0⤋
Do your own homework.
You won't learn a thing this way.
But try this:
700=-16t^2+60t+9
And work from there.
2006-10-28 02:23:29 · answer #3 · answered by Vivien 2 · 0⤊ 0⤋