# @ elena - intro to physics

posted by .

I posted this question earlier and thank you for respnding, but the answer you give me was incorrect. I try looking at hw you solve and cant find the mistake but when when I check your answer it said it was wrong. Can you please look over it again, I greatly appreciate it

a toy rocket moving vertically upward passes by a 2.2m- high window whose sill is 7.0m above the ground. the rocket takes 0.17s to travel the 2.2m height of the wondow
part a): what was the launch speed of the rocket ? assume the propellant is burned very quickly at blastoff

part b) how high will the rocket go ?

• @ elena - intro to physics -

What is the correct answer? I'll try to understand where is the mistake.

• @ elena - intro to physics -

I‘ve found the mistake

h(o) = v(o)•t - g•t^2/2,
2 h(o) = 2 v(o)•t - g•t^2
v(o) = h(o) /t +gt/2 = 2.2/0.17 + 9.8•0.17/2 = 13.77 m/s.
Then try to calculate yourself…

## Similar Questions

1. ### Math

find two factors of 28 with the sum of 11. Surely by the time you posted this question, you should have been able to figure out that very simple question. Give it a try!!! Let me know what you came up with. well I think its 7 and 11. …
2. ### Physics

I posted something concerning this question earlier.. and thank you for checking and letting me know of my mistake. I said that for a given velocity, the height does not depend on the mass of the ball. How could I explain this, besides …
3. ### intro chemistry

Can you tell me why ketones and aldehydes don't bond with hydroxyl groups?
4. ### Physics

An Olympic basketball player shoots towards a basket that is 5.98 m horizontally from her and 3.05 m above the floor. The ball leaves her hand 1.90 m above the floor at an angle of 60.0o above the horizontal. What initial speed should …
5. ### @elena

You helped me with this question earlier today, the answer you got was incorrect, i tried looking through your calculations but i cant find the mistake. the program wont let me see the right answer just tells the answer i put in was …
6. ### statistics

Does studying for an exam pay off? The number of hours studied, x, is compared with the exam grade received, y. x 7 7 5 5 7 y 95 90 75 85 95 (a) Complete the preliminary calculations: SS(x), SS(y), and SS(xy). Incorrect: Your answer
7. ### Statistics

Does studying for an exam pay off? The number of hours studied, x, is compared with the exam grade received, y. x 7 7 5 5 7 y 95 90 75 85 95 (a) Complete the preliminary calculations: SS(x), SS(y), and SS(xy). Incorrect: Your answer
8. ### Math

Does studying for an exam pay off? The number of hours studied, x, is compared with the exam grade received, y. x 7 7 5 5 7 y 95 90 75 85 95 (a) Complete the preliminary calculations: SS(x), SS(y), and SS(xy). Incorrect: Your answer
9. ### math

Can someone please help me on these I have look at the examples and done just what they did, but I still get it wrong and I only have one more time to try. Use the following table to answer the questions. (Give your answers correct …
10. ### math help

Use the following table to answer the questions. (Give your answers correct to two decimal places.) x 1 1 3 3 5 5 7 7 9 9 y 3 2 6 1 3 3 3 2 5 3 (a) Find the equation of the line of best fit. y hat = + x (ii) Graph this equation on …

More Similar Questions