Practice question
Question
Three 5kg masses form an equilateral triangle of side 4m. What is the potential energy of the system? (G\=6.67×10−11N m2/kg2)
Explanation
3 pairs: V = −3Gm2r. V = −36.67×10−11×5×54. V = −3×4.169×10−11 = −1.25×10−10J. As per NCERT, applying relevant law/formula with correct units and sign convention leads to -1.2 × 10⁻¹⁰ J. This satisfies dimensional consistency and physical conditions given, so option A is scientifically correct.