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21 April, 04:33

A 450-g black crow is raiding the recently-filled bird feeder. As someone runs out the back door to scare the crow away, it pushes off the 670-gram feeder with a takeoff speed of 1.5 m/s. Determine the speed at which the feeder initially recoils backwards.

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  1. 21 April, 04:47
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    2.50 m/s

    Explanation:

    This question can be solved using momentum conservation equation

    combined mass of crow and feeder = 450+670=1120 gm

    let the recoil speed of feeder be v m/s

    Then applying momentum conservation we get;

    1120*1.5 = 670*v

    v = 2.50 m/s

    the speed at which the feeder initially recoils backwards = 2.50 m/s
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