9. A stone is dropped from a certain height on earth
and it takes 12 seconds to reach the ground. If the
same stone is dropped from the same height on
moon, find the time that it will take to reach the
surface of the moon. (Ignore the air resistance).
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Time taken by stone at earth t = 12 sec
at earth a = g
So H = 1/2 g t^2
H = 5 * 12^2
At moon a = 6g
So H = 1/2 g/6 t^2
144 * 5 = 1/2 * 10/6 * t^2
Thus t = 29.39 Sec