(i)[4]
Show that the rocket’s speed after $10\,\text{s}$ is $40\,\text{m s}^{-1}$, and determine the rocket’s acceleration during the first $10\,\text{s}$.
(ii)[2]
After $10\,\text{s}$, the rocket’s fuel has stopped burning and there is no upward force acting on the rocket. Find the maximum height above ground level reached by the rocket.
(iii)[4]
Determine the total time from the instant the rocket is launched until it returns to the ground.
(c(iii))[4]
Determine the total time from the instant the rocket is launched until it returns to the ground.