Question 383279
{{{ s = 4.9t^2}}}
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{{{(s/4.9)=t^2}}}
{{{sqrt(s/4.9)=t}}}
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substitute the value os s =122.5
{{{sqrt(122.5/4.9)=t}}}
{{{(highlight(t = 5 seconds))}}}
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m.ananth@hotmail.ca