Answer:
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Step-by-step explanation:
Original Kinetic energy = 0.5mv²
= 0.5(5.0kg)(4.0m/s)² = 40J.
New Kinetic energy = 0.5(5.0kg)(10.0m/s)² = 250J.
Hence net work done = 250J - 40J = 210J.
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