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= (Ek₂ - Ek₁)
= (¹/₂ mv²) - (¹/₂ mv²)
= (¹/₂ × 100 × (5)²) - (¹/₂ × 100 × (0)²)
= (¹/₂ × 100 × 25) - (¹/₂ × 100 × 0)
= 1250 - 0
= 1250 J
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