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anonymous

  • 5 years ago

A rock is launched from a cannon. After 1 second, the rock is 243 feet in the air; after 2 seconds, it is 452 feet in the air. Using the quadratic function, find the height, in feet, of the rock after 5 seconds in the air

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  1. anonymous
    • 5 years ago
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    I've seen a similar problem to it yesterday, and I got confused lol ^_^"

  2. anonymous
    • 5 years ago
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    What is the angle at which it is launched?

  3. anonymous
    • 5 years ago
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    doesn't say.

  4. amistre64
    • 5 years ago
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    a+b = 243 a = 243 - b 4a +2b = 452 4(243-b) +2b = 452 892 -4b + 2b = 452 892 -452 = 2b 440/2 = b b = 220 -------------- a = 243-220 = 23 23x^2 +220x = y -------------------- 23 + 220 = 243 checks 23(4) + 220(2) = 452 92 + 440 = 30 ok.....whatd I do wrog..hard to type in the dark :)

  5. anonymous
    • 5 years ago
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    assume it is launched straight up. say its initial acceleration is a. distance is ut+1/2at^2

  6. anonymous
    • 5 years ago
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    initial speed is 0. so d = 1/2 at^2

  7. amistre64
    • 5 years ago
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    its a simple quad equation, not physics....but that might be a shot :)

  8. amistre64
    • 5 years ago
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    (0,0) (1,243) (2,452)

  9. anonymous
    • 5 years ago
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    since it is launched straight up in the air, the gravity is acting against the rock. so s = 1/2(a-32.17)t^2

  10. amistre64
    • 5 years ago
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    1a + 1b = 243 b = 243-a 4a + 2b = 452 4a + 2(243-a) = 452 4a +486 -2a = 452 2a = 452 - 486 2a = -34 a = -17 by that

  11. anonymous
    • 5 years ago
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    oh okay, then you should follow amistre 64's procedure.

  12. amistre64
    • 5 years ago
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    b = 243 --17 b = 260 -17x^2 +260x = y -17(4) + 260(2) = 452 -68 + 520 = 452 right? someone tell me its right lol

  13. anonymous
    • 5 years ago
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    452 is the height of the rock at 2 seconds.

  14. anonymous
    • 5 years ago
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    amistre64 can u please help me

  15. amistre64
    • 5 years ago
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    the numbers are working yay!!...plug in a 5

  16. anonymous
    • 5 years ago
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    plug in a 5 where?

  17. amistre64
    • 5 years ago
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    -17(25) +260(5) = ?

  18. anonymous
    • 5 years ago
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    that's what i thought. i just tried it. i got 875

  19. amistre64
    • 5 years ago
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    -425 + 1300= 875....me too :)

  20. anonymous
    • 5 years ago
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    correct! one more to go! let's hope i pass it this time! i've only missed one outta 4. on to the 5th question. thanks amistre64!

  21. amistre64
    • 5 years ago
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    i wrote you a quad program today, but left my flash drive at the college lol

  22. anonymous
    • 5 years ago
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    thanks though!

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