Question 859322
You would look for the t-intercept, using t-axis as the horizontal axis.


{{{d=310^2-4(-4.9)178}}}
{{{d=99588.8}}}


Taking the positive result, {{{t=(-310-sqrt(d))/(2*(-4.9))}}}
{{{t=(315.6+310)/(9.8)}}}
{{{t=63.8}}} seconds