An object with a speed of 20.meters per second has a kinetic energy of 400. J. The mass of the object is A .1.0 kg B. 2.0 kg

Question

An object with a speed of 20.meters per second has a kinetic energy of 400. J. The mass of the object is
A .1.0 kg
B. 2.0 kg
C. 0.50 kg
D. 40 kg

explain why

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Gia Bảo 2 months 2021-08-18T07:13:51+00:00 2 Answers 3 views 0

Answers ( )

    0
    2021-08-18T07:15:17+00:00

    Answer:

    Option B. 2.0 kg

    Explanation:

    Data obtained from the question include:

    V = 20m/s

    K.E = 400J

    m =?

    K.E = 1/2 mV^2

    400 = 1/2 x m x (20)^2

    400 = 1/2 x m x 400

    400 = m x 200

    Divide both side by 200

    m = 400/200

    m = 2kg

    The mass of the object is 2kg

    0
    2021-08-18T07:15:49+00:00

    Answer:

    2 Kg

    Explanation :

    Kinetic Energy = 1/2×(mass of object)×(velocity)²

    given Kinetic Energy = 400 Joules

    velocity = 20 m/s

    putting this given value of kinetic energy & velocity in the above equation

    400  = 1/2×(mass of object)×(20)²

    ∴ mass of object = (400×2)/400

    mass of object = 2 Kg.

    Hence option B is the correct answer

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )