Question

A rocket, initially at rest on the ground, accelerates straight upward from rest with constant acceleration 49.0ms^-2 . The acceleration period lasts for time 10s until the fuel is exhausted. After that, the rocket is in free fall.

Answer 1

\[y=1/2at^2\]
\[v=49(10)=490\]
\[490^2=2(9,8)y\]

Answer 2

constant a,????means