Anonymous
Anonymous asked in Science & MathematicsPhysics · 9 months ago

physics homeworkk?

Two objects of same material are traveling

near you. Object A is a 1.7 kg mass traveling

14 m/s; object B is a 2 kg mass traveling 5 m/s.

Which object would make you feel worse if

you are hit by it?

3 Answers

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  • MyRank
    Lv 6
    8 months ago

    Given,

    Object A:-

    Mass (m) = 1.7 kg

    Speed (v) = 14 m/sec

    Momentum (p) = Mass (m) x speed (v) = 1.7 kg x 14 m/sec = 23.8 kg.m/sec

    Kinetic Energy (K.E)A = ½mv² = ½ x 1.7 kg x (14 m/sec)²

    = 166.6 J.

    Object B:-

    Mass (m) = 2 kg

    Speed (v) = 5 m/sec

    Momentum (p) = Mass (m) x speed (v) = 2 x 5 = 10 kg.m/sec

    Kinetic Energy (K.E)B = ½ mv² = ½ x 2 x (5)² = 25 J

    ∴ (K.E)A > (K.E)B.

  • Mangal
    Lv 4
    9 months ago

    Momentum = mv, KE = ½mv²

    Object 1: momentum = 23.8 kgm/s; kinetic energy = 166.6 J

    Object 2: momentum = 10.2 kgm/s; kinetic energy = 25.0 J A

    Ans: Object 2 (both momentum and kinetic energy are more than those of Object 2)

  • 9 months ago

    ma = mass of Object A = 1.7 kg

    va = velocity of Object A = 14 m/s

    mb = mass of Object B = 2 kg

    vb = velocity of Object B = 5 m/s

    KEa = kinetic energy of Object A = to be determined

    KEb = kinetic energy of Object B = to be determined

    KINETIC ENERGY

    KE = 0.5mv²

    KEa = 0.5·ma·va²

    KEa = (0.5)·(1.7 kg)·(14 m/s)²

    KEa = 166.6 J

    KEb = 0.5·mb·vb²

    KEb = (0.5)·(2 kg)·(5 m/s)²

    KEb = 25 J

    Therefore, KEa > KEb.

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