The kenetic energy of E of an object varies jointly as the mass m of the object and the square of its velocity v. pasagot
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The kenetic energy of E of an object varies jointly as the mass m of the object and the square of its velocity v. pasagot
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K = mv2/2 = (20 kg)(21 m/s)2/2 J = 4410 J
By the way, 20 kg is its mass, which is not the same thing as its weight.