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March 30, 2017

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A ball is released from a hot air balloon moving downward with a velocity of
-10.0 meters/second and a height of 1,000 meters. How long did it take the ball to reach the surface of Earth? Given: g = -9.8 meters/second2.

  • physics - ,

    hf=hi+vi*t+1/2 a t^2
    0=1000-10t-4.9t^2

    solve the quadratic

    t=(-10+-sqrt(100+19600))/-9.8
    t=-150/-9.8=15.3sec

    check that.

  • physics - ,

    incorrect

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