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21 November, 07:39

A 5.0-g egg falls from a 90-cm-high counter onto the floor and breaks. What impulse is exerted by the floor on the egg?

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  1. 21 November, 08:38
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    0.021 kgm/s

    Explanation:

    using energy

    change potential energy of the egg = change in kinetic energy of the egg

    mgh = 1/2 mv² m in kg, h in meters

    5.0g = 5.0/1000 kg = 0.005 kg

    90 cm = 90 / 100 = 0.9 m

    cancel m on both side

    gh = 1/2 v²

    make v subject of the formula

    v = √2gh = √2*9.81*0.9 = √17.658 = 4.2 m/s that is the velocity of the egg on impact with floor and the initial velocity of the egg is zero.

    impulse = m * Δv = 0.005 * 4.2 = 0.021 kgm/s
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