Question 181633
{{{ t=2*pi*sqrt(L/9.8) }}}
{{{ drawing( 300, 300, -1, 5, -1, 5,grid(1),
circle(2.5,3.2,.1),
circle(3.5,3.75,.1),
graph( 300, 300, -1, 5, -1, 5,  6.28*sqrt(x/9.8))) }}}
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Using the graph,
{{{ t(2.5)=3.1}}}
{{{ t(3.5)=3.7 }}}
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or plugging into the equation,
{{{ t(2.5)=2*pi*sqrt(2.5/9.8)=3.17 }}}
{{{ t(3.5)=2*pi*sqrt(3.5/9.8)=3.75 }}}