Answer
68.89m.
Work Step by Step
On the Moon, the acceleration due to gravity is $\frac{1}{6}th$ that of earth $=\frac{1}{6}\times 9.8 m/s^{2}=1.633 m/s^{2}$
$v^{2}=u^{2}+2aS$
$0=15^{2}-2\times 1.633\times S$
$S=68.89m$
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