Practice question
Question
Three 6kg masses form an equilateral triangle of side 8m. What is the potential energy of the system? (G\=6.67×10−11N m2/kg2)
Explanation
3 pairs: V = −3Gm2r. V = −36.67×10−11×6×68. V = −3×3.0015×10−11 = −9.0×10−11J. As per NCERT, applying relevant law/formula with correct units and sign convention leads to -9.0 × 10⁻¹¹ J. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.