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Time period of a pendulum is T. What will be the time period if length becomes 5 times and g becomes 1/5 times at some height from the earth?
Difficulty: Easy
A: 
$\rm{5\,T}$
B: 
$\rm{\frac{t}{5}}$
C: 
$\rm{15\,T}$
D: 
$\rm{25\,T}$
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