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Let earth's radius = R_e
Earth's mass =  M_e

moon's radius = R_m=\frac{R_e}{4}
Earth's mass =  M_m=\frac{M_e}{80}

g_e = \frac{GM_e}{R_e^2} = 9.8 ms²

g_m= \frac{GM_m}{R_m^2} = \frac{G(M_e/80)}{(R_e/4)^2} = \frac{GM_e \times 16}{80 \times R_e^2} =\frac{GM_e}{R_e^2} \times \frac{16}{80} =g_e \times \frac{1}{5}

g_m= \frac{g_e}{5}= \frac{9.8}{5}\ m/s^2 =1.96\ m/s^2

So acceleration due to gravity will be 1.96 m/s² on the surface of moon.
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