Posted by Jackie on Monday, September 13, 2010 at 11:35pm.
Start by computing the velocity and altitude achieved while the engine is on. Then write the equation for height and velocity during free fall. It's not that hard.
When the velocity is zero during the free fall stage, maximum height has been reached. Solve for that time, and the altitude reached then. So much for (a). For (b), solve for the time when the altitude is zero.
For (c), a shortcut would be to take the kinetic energy and altitude H at burnout, add 2gH to V^2 at burnout, and solve for the new V^2 at impact
Show us your work if you need further assistance here.
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