Tadeh launches a model rocket straight up from his backyard that takes 6.96 s to reach its maximum altitude. (After launch, the rocket's motion is only influenced by gravity. Enter magnitudes only.)
(a) What is the rocket's initial velocity?


(b) What is the maximum altitude reached by the rocket?


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  1. a)

    Use the equation of motion: v = u + at

    => v = 0 m/s, a = -9.8 m/s^2, t = 6.96 sec

    => u = v - at = 0 - (-9.8)(6.96)
    = 68.2 m/s


    Use the equation of motion: 2as = v^2 - u^2

    => a = -9.8 m/s^2, v = 0, u = 68.2 m/s

    => 2(-9.8)h = -(68.2)^2
    => 2*h = (68.2)(6.96)
    => h = 474/2
    = 237 m

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