A rocket accelerates straight up from the ground at $12\mathrm{.}9$ m$/$s$^2$ for $11\mathrm{.}07$ s$.$ Then the engine cuts off and the rocket enters free fall.

a$)$ find the velocity at the end of its upward acceleration

b$)$ what max height does it reach

c$)$ with what velocity does it crash to earth

d$)$ what's the total time from launch to crash

I got a$)$ correct at $142\mathrm{.}8$ m$/$s$,$ but cannot get b$/$c$/$d$.$ Help!