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March 27, 2017

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A helicopter is ascending vertically with a speed of 5.20 m/s. At a height of 125 m above the Earth, a package is dropped from a window. How much time does it takes the package to hit the ground? [Hint: The package's initial speed equals the helicopter's]

  • Physics - ,

    h=v²/2g=5.2²/2• 9.8=1.38 m.
    H=125+1.38=126.38 m
    t=sqrt(2•H/g) = sqrt(2•126.38/9.8)=5.08 s.

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