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    ryty's Avatar
    ryty Posts: 8, Reputation: 1
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    #1

    Sep 21, 2009, 09:18 PM
    physics on accleration
    A model rocket blasts off and moves upward with an acceleration of 12m/s^2 until it reaches a height of 30m , at which point its engine shuts off and it continues its flight in free fall.
    A-what is max height?
    B-What is speed just before the rocket hits the ground?
    C-What is rockets total duration of flight?
    InfoJunkie4Life's Avatar
    InfoJunkie4Life Posts: 1,409, Reputation: 81
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    #2

    Sep 21, 2009, 11:27 PM

    To figure the speed of the rocket when it reaches 30m you need to use the sqrt(2*12m/s/s*30m)

    and after that it will slow down at -9.8m/s/s

    thus reverse the above eqn for distance and use 9.8 (it will be the same, you can't have a negative distance) for acceleration.

    (2*[speed at 30m]^2)/9.8 will give you the distance it travels after 30m.

    total distance = 30m + distance after 30m

    sqrt(2*9.8*[total distance]) speed at grnd

    I can't think of the time eqn... too late for me... good luck.

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