Verified answer

I have posted a full solution to your question at one of the math help forums I collaborate with, so that I may give you an easy to read explanation using LaTeX:

http://www.mathhelpboards.com/f52/minimum-speed-~v...

Hope this helps.

you will locate out the value by taking the by-synthetic from the 1st equation; then, to locate its velocity at t = a million s, plug it into the warm equation you derived attempt it out first