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A ball of mass 0.5 kg slows down from a speed 5m per second to that of 3metre per second calculate the change of its kinetic energy of the ball |
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Answer» in kinetic ENERGY = 1/2mv^2 - 1/2 mu^2 = 1/2×5/10 ×3 - 1/2 × 5/10 × 5= - 0.5J ( negative SIGN as the BALL is SLOWING down ) |
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