O.K. I got htis part right... But I can't get it when I do the substitutes.... it confuses me... Can someone explain haw you go about it.
v=3k+5d solve for d
This is what I have
3K=5d=v
3k+5d-3k=v-3k
5d=v-3k
5d/5=v-3k/5
d= v-3k/5
Then I have to substitute.... Now i panic!!
Calculate the value of v when D = 20m , a = 9.8 m/s2, t = 20s
2007-01-13 14:46:11 · 8 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
v=3k+5d
5d= v-3k
d= (v-3k)/5
x=1/2at^2+vt
20=1/2(-9.8)(20)^2+v(20)
1980=v(20)
v=99m/s
2007-01-13 14:54:32 · answer #1 · answered by 7 · 0⤊ 0⤋
You are fine at d = (v - 3k)/5. Set d = 20m => 20m = (v - 3k)/5. Isolate "v": 20m * 5 = v - 3k => v - 3k = 100m => v = 3k + 100m. This is as far as you can go. It's nice to have a = 9.8 m/s^2 and t = 20 s. "a" is basic acceleration of a falling body in the air. "t" is just time, 20 sec. The problem is there's no place for them in the equation, unless you missed something typing it into the computer from your source. This appears to be the makings of a physics problem, but I can't tell you much more than that. Sorry.
2007-01-13 23:27:49 · answer #2 · answered by flyfisher_20750 3 · 0⤊ 0⤋
You have d wrong.
v = 3k + 5d
v - 3k = 5d
(v - 3k) / 5 =d
Ok, now you can plug-n-chug.
But the a and t values are confusing me since they are not in the equation.
2007-01-13 23:02:34 · answer #3 · answered by antoinebucher 1 · 0⤊ 0⤋
Whoa!!
V = 3K + 5D
V - 3K = 5D
5D = V - 3K
D = (V - 3K)/5
That's solving for D. I have no idea where a and t come in.
2007-01-13 22:54:01 · answer #4 · answered by dollhaus 7 · 0⤊ 0⤋
You forgot to divide v by 5 also
2007-01-13 22:59:40 · answer #5 · answered by hello 6 · 0⤊ 0⤋
whoa the equation is tricky why don't you try to consult it with your teacher, they would be the better one to help you out lol
ive try the equation but it's confusing because a and t is not in the equation ok lol
2007-01-14 00:12:32 · answer #6 · answered by prisky 1 · 0⤊ 0⤋
Recall that v = at. That means
v = (9.8) (20) = 19.6
2007-01-13 22:54:39 · answer #7 · answered by Puggy 7 · 0⤊ 0⤋
no clue i HATE math sorry
2007-01-13 22:53:48 · answer #8 · answered by Mike T 2 · 0⤊ 0⤋