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25 April, 06:20

An object is dropped from rest from a height of 4.4 107 m above the surface of the Earth. If there is no air resistance, what is its speed when it strikes the Earth?

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  1. 25 April, 06:36
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    An object is drop from a height, then it is in direction of gravity

    g is + ve

    When an object drop from a height, the initial velocity is 0,

    U=0

    Given that h=4.4*10^7m

    V=?

    g=9.81m/s^2

    Then using equation of motion

    V^2=U^2+2gh

    V^2=0+2*9.81*4.4*10^7

    V^2=86.33*10^7m/s

    Take square root of both side

    V=29381.63m/s

    Now to km/s, divide by 1000

    Since 1km=1000m

    V=29.38km/s
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