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Potential energy mgh=3×10×4=120J. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 120 J. 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: Work, Energy and Laws of Motion - Mixed Practice
Initial K=12×900×142=88200J. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 88200 J. 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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