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28 October, 19:25

A puppy has 245 J of KE. It has a velocity of 7 m/s. What is it's mass?

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  1. 28 October, 20:31
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    Answer: 10kg

    Explanation:

    Given that:

    Kinetic energy of puppy = 245J

    Velocity of puppy = 7 m/s

    mass of puppy = ?

    Recall that kinetic energy is the energy possessed by a moving body. It is measured in joules, and depends on the mass and velocity of the moving body

    i. e K. E = 1/2 x mass x (velocity) ^2

    245J = 1/2 x mass x (7 m/s) ^2

    245 = 0.5 x mass x 49

    245 = 24.5 x mass

    Mass = 245/24.5

    Mass = 10kg

    Thus, the mass of the puppy is 10kg
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