Physics

A 5.00 x 102 kg hot air balloon takes off from rest at the surface of the earth. The buoyant force lifts the balloon straight up, performing 9.70 x 104 J of work on the balloon. At the instant the balloon's upward speed is 4.08 m/s, the balloon will be ____ m above the surface of the earth.

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  1. KE+PE=Total Work
    ((1/2)mv^2) + (mgh) = W
    W = 9.7x10^4 J
    v = 4.08 m/s
    m = 500 kg
    g = 9.8 m/s^2
    Rearrage for h
    h = (W - ((1/2)mv^2)) / mg
    h = 18.9466m

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  2. Excellent

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