Question 248253
{{{h=224t-16t^2}}} Start with the given equation.



{{{0=224t-16t^2}}} Plug in {{{h=0}}} since the height at the ground level is zero.



{{{-16t^2+224t=0}}} Rearrange the equation and terms.



{{{-16t(t-14)=0}}} Factor out the GCF -16t



{{{-16t=0}}} or {{{t-14=0}}} Set each factor equal to zero.



{{{t=0}}} or {{{t=14}}} Solve for 't' in each equation



So the object will be at the ground level when t=0 or t=14. Ignoring the trivial answer of 0, this means that the object will hit the ground after 14 seconds.