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26 June, 01:16

If an object moving with a speed of 18 m/s and has a kinetic energy of 140 J, what is the mass of the object?

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  1. 26 June, 02:35
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    m = mass of the object moving = ?

    v = speed of the object moving = 18 m/sec

    K = kinetic energy of the object moving = 140 J

    Kinetic energy of an object is given as

    K = (0.5) m v²

    where m = mass of object, v = speed of object, K = kinetic energy of object

    hence for object, kinetic energy is given as

    K = (0.5) m v²

    inserting the values

    140 = (0.5) m (18) ²

    140 = 162 m

    m = 140/162

    m = 0.86 kg

    hence mass of the object comes out to be 0.86 kg
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