Question

Find the height, in feet, of the rock after 5 seconds in the air.
A rock is launched from a cannon. It’s height, h(x), can be represented by a quadratic function in terms of time, x, in seconds.
After 1 second, the rock is 129 feet in the air; after 2 seconds, it is 236 feet in the air.

Answer 1

@JoKeR0331

Answer 2

someone please help

Answer 3

pleaseeeee

Answer 4

@unknownunknown

Answer 5

Do we have the angle of the cannon, is it firing directly upward?

Answer 6

it dosent say @unknownunknown

Answer 7

Can you do a screenshot of the question?

Answer 8

i cant its a test

Answer 9

do you want me to put every detail? @unknownunknown

Answer 10

We will need every detail.. that's insufficient information as it is.

Answer 11

Help please A rock is launched from a cannon. It's height, h(x), can be represented by a quadratic function in terms of time, x, in seconds.After one second, the rock is 129 feet in the air; after 2 seconds, it is 236 feet in the air. Find the height, in feet, of the rock after 5 seconds in the air.

Answer 12

@unknownunknown all of it

Answer 13

Alright well, I'm going to assume a lot, so I can't see if this will be definitely correct, but the question contains incorrect information to answer properly. So we'll just have to proceed with what we have..

Let me confirm the equation to make sure, one sec.

Answer 14

insufficient information*

Answer 15

so you cant solve it at all? @unknownunknown

Answer 16

@unknownunknown ?????

Answer 17

Is there a multiple choice or you must write the answer?

Answer 18

must write the answer @unknownunknown

Answer 19

So, if we let y equal the displacement, y = 9.8*t^2/2 + initial velocity * time
So first of all, we'll need to solve for the initial velocity, can you rearrange the equation to solve for v?

y=9.8*t^2/2 + v * t

Answer 20

Actually since it's coming down, we should make 9.8*t^2/2 negative.

So y = -9.8*t^2/2 + v*t

Answer 21

i think its a large number for feet @unknownunknown

Answer 22

I'd say the answer is approximately 527, somewhere around there.

Answer 23

its not @unknownunknown

Answer 24

And how do you know that?

Answer 25

i just tried

Answer 26

@unknownunknown

Answer 27

Ok wait, let me work it out

Answer 28

Have you covered gravity in class? g = 9.8?

Answer 29

no @unknownunknown

Answer 30

Okay so. Let's say we have a function.. f(t) = -11*t^2 + 140*t

If we plug into this equation t=1, we have -11 + 140 = 129 which satisfies the first part

Then if we plug t=2, we have -11*4 + 140*2 = 236 which satisfies the second part

Answer 31

So then for f(5) = -11*25 + 140*5 = 425

Answer 32

right @unknownunknown

Answer 33

Okay, good.

Answer 34

can you help with another one @unknownunknown

Answer 35

Widget wonders produces widgets. They have found that the cost, c(x), of making x widgets is a quadratic function in terms of x.

The company also discovered that it costs $23 to produce 2 widgets, $103 to produce 4 widgets, and $631 to produce 6 widgets.

Answer 36

@unknownunknown