Given: M_s = 3\ imes10^5\\ M_e d = 2.5 \ imes 10^4\\ R_e Also V_e = 11.2 Km/s = \\sqrt{\\dfrac{2GM_e}{R_e}} Now for the sun earth system, \\dfrac{1}{2}mV_s^2 - \\dfrac{GM_em}{R_e}-\\dfrac{GM_sm}{R_e+d}=0 Assuming R_e