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Initial K=12×1500×202=300000J. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 7 m. This satisfies dimensional consistency and physical conditions given, so option A is scientifically correct.
Ref: NCERT Class 11 Physics > Chapter 6: Work, Energy and Power > Topic: Collisions and Power
Initial K=12×800×122=57600J. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 5 m. This satisfies dimensional consistency and physical conditions given, so option A is scientifically correct.
Ref: NCERT Class 11 Physics > Chapter 6: Work, Energy and Power > Topic: Laws of Motion and Energy Conservation
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