Question 940050


 the formula is:

{{{h = -16t^2+s}}}  

where {{{h}}} is the ending height (at the end height is {{{0}}}) in feet and 
{{{t}}} is time in seconds, and {{{s=10000}}} starting height 

{{{0 = -16t^2+10000}}}......divide both sides by {{{16}}}

{{{0 = -t^2+625}}}

{{{t^2= 625}}} take square roots of both sides:

{{{sqrt( t^2)=sqrt(625) }}}

{{{t=25 }}}

Answer: it will hit the ground in {{{25}}} seconds