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31 May, 17:27

Calculate the kinetic energy of a 100.0-kg meteor approaching the Earth at a speed of 10.0 km/s. Remember that 1 km = 1000 m.

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Answers (2)
  1. 31 May, 20:50
    0
    Kinetic Energy = (1/2) (mass) (speed squared)

    Mass = 100 kg

    Speed = 10 km/s = 10,000 m/s

    Speed squared = 100,000,000 m²/s²

    1/2 (M) (V²) = 1/2 (100) (100,000,000) = 5,000,000,000 joules (5 x 10⁹ J)

    That's 5 billion joules.

    That's the amount of energy a 100-watt light bulb uses in 579 days.
  2. 31 May, 20:58
    0
    KE=1/2 x mass x speed^2

    Substitute:

    KE=1/2 x 100 x 10000^2

    5000000000J of KE

    So either 5 gigajoules

    Or 5x10^9J
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