A firework rocket starts from rest at ground level and moves vertically. In the first 3 s of its motion, the rocket rises 27m. The rocket is modelled as a particle moving with constant acceleration 6 m/s2
a) Find the speed of the rocket 3 s after it has left the ground.
After 3 s, the rocket burns out. The motion of the rocket is now modelled as that of a particle moving freely under gravity.
b) Find the height of the rocket above the groud 5 s after it has left the ground.
:eek: