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Calculate the initial kinetic energy if the initial velocity of an object is 6 m/s and the mass of an object is 40 Kg.

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720 J

420 J

1720 J

1080 J

answer is B.

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Detailed Solution

Mass of the object = 40 Kg

Initial velocity, u = 6 m/s

$E_{k} = \frac{1}{2} {mu}^{2}$

$E_{k} = \frac{1}{2} \times 40 \times 6^{2}$

$E_{k} = 20 \times 36$

$E_{k} = 720 J$

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