Practice question

ΔE = −GMEm(1r2−1r1). r1 = 3.84×107m, r2 = 7.68×107m. ΔE = −6.67×10−11×6×1024×200(17.68×107−13.84×107). ΔE = −8.004×1016(−1.302×10−8)≈1.04×109J. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 1.0 × 10⁹ J. This satisfies dimensional consistency and physical conditions given, so option A is scientifically correct.