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Math Help - projectile motion

  1. #1
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    projectile motion

    I am having some serious difficulety determining (b) the speed upon impact



    In Fig. 4-36, a stone is projected at a cliff of height h with an initial speed of 48.0 m/s directed at an angle θ0 = 50.0 above the horizontal. The stone strikes at A, 5.21 s after launching. Find (a) the height h of the cliff, (b) the speed of the stone just before impact at A, and (c) the maximum height H reached above the ground.
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    Quote Originally Posted by BiGpO6790 View Post
    I am having some serious difficulety determining (b) the speed upon impact



    In Fig. 4-36, a stone is projected at a cliff of height h with an initial speed of 48.0 m/s directed at an angle θ0 = 50.0 above the horizontal. The stone strikes at A, 5.21 s after launching. Find (a) the height h of the cliff, (b) the speed of the stone just before impact at A, and (c) the maximum height H reached above the ground.
    v_x is a constant 48\cos(50)

    v_y(5.21) = 48\sin(50) - g(5.21)


    impact speed = \sqrt{(v_x)^2 + [v_y(5.21)]^2}
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