A 1.5kg block slides down a frictionless incline from 12m height. What is its speed at the bottom? (Take g\=10m/s2)
Potential energy mgh=1.5×10×12=180J. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 15 m/s. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.
Ref: NCERT Class 11 Physics > Chapter 6: Work, Energy and Power > Topic: Work, Energy and Laws of Motion - Mixed Practice