3. How much energy is stored in a ball of mass 80 kg which is moving with a velocity of 5 m/s? If the ball is replaced by an iron sphere of mass 400kg, moving with the same velocity, calculate the energy stored in the iron sphere.
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the amount of energy stored in a ball of mass 80kg is 400 kg m/s. the energy stored in an iron sphere of mass 40kg is 2000 kg m/s
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