A 7kg mass falls from 3m onto a spring (k\=2000N/m). What is the maximum compression? (Take g\=10m/s2)
Potential energy mgh=7×10×3=210J. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 210 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: Energy Conservation and Friction