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17 November, 18:51

a bullet ofmass 0.05kg has a speed of 400m/s. what is its kinetic energy? If it hits a wall of which the averageresistive force is 10000N, calculate the distance penetrated by the bullet

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  1. 17 November, 21:03
    0
    4000 J

    0.4 m

    Explanation:

    Kinetic energy is one half the mass times the square of velocity:

    KE = ½ mv²

    Given m = 0.05 kg and v = 400 m/s:

    KE = ½ (0.05 kg) (400 m/s) ²

    KE = 4000 J

    Work = change in energy

    W = ΔKE

    Fd = KE

    (10000 N) d = 4000 J

    d = 0.4 m
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