Question 314421
The rocket is on the ground when {{{h=0}}}.
{{{48t-16t^2=0}}}
{{{t(48-16t)=0}}}
Two solutions:
{{{t=0}}}, The rocket hasn't left yet.
.
.
.
{{{48-16t=0}}}
{{{16t=48}}}
{{{t=3}}}
The rocket will hit the ground in 3 seconds.