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9 February, 11:31

You stand on top a building 44 m tall with a water balloon. You drop the water balloon from rest. How fast is the balloon moving when it is halfway down the building? (assume no friction)

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  1. 9 February, 11:54
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    The balloon is moving when it is halfway down the building at 20.78 m/s.

    Explanation:

    We have equation of motion v² = u² + 2as

    Initial velocity, u = 0 m/s

    Acceleration, a = 9.81 m/s²

    Displacement, s = 0.5 x 44 = 22 m

    Substituting

    v² = u² + 2as

    v² = 0² + 2 x 9.81 x 22

    v² = 431.64

    v = 20.78 m/s

    Velocity at 22 m = 20.78 m/s

    The balloon is moving when it is halfway down the building at 20.78 m/s.
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