(a)[1]
Give the definition of acceleration.
(b(i))[1]
Find the acceleration of the rocket.
(b(ii))[2]
Show that the height of the rocket above the Earth’s surface at 20 s after launch is 3.2 km.
(c(i))[2]
The rocket’s mass in (b) is $2.9 \times 10^6\,\text{kg}$. Take this mass to stay constant. For this rocket, from launch to its height 20 s later: calculate the increase in gravitational potential energy $\Delta E_P$.
(c(ii))[2]
Calculate the increase in kinetic energy $\Delta E_K$.
(c(iii))[2]
Determine the mean power output of the rocket engines. Assume resistive forces are negligible.