19 What is the mass of a ball that is traveling 30 m/s and has 4.5 J of kinetic energy? ave a GPF of 35512

Question

19
What is the mass of a ball that is traveling 30 m/s and has 4.5 J of kinetic energy?
ave a GPF of 35512

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Thành Công 4 years 2021-08-17T14:34:11+00:00 1 Answers 13 views 0

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  1. thienhuong
    0
    2021-08-17T14:35:58+00:00
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    Answer: The mass of ball is 10 grams.

    Explanation:

    Given : Kinetic energy = 4.5 J

    Velocity = 30 m/s

    The formula for Kinetic energy is as follows.

    K.E = \frac{1}{2}mv^{2}

    where,

    K.E = Kinetic energy

    m = mass

    v = velocity

    Substitute the values into above formula as follows.

    K.E = \frac{1}{2}mv^{2}\\4.5 J = \frac{1}{2} \times m \times (30 m/s)^{2}\\m = \frac{4.5 J \times 2}{900 m^2/s^2} (1 Js^{2} = kg m^{2})\\= 0.01 kg (1 kg = 1000 g)\\= 10 g

    Thus, we can conclude that the mass of ball is 10 grams.

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