It can be quite confusing applying the formula for planetary gravity to the likely velocity achievable by using a continuously accelerating machine. Finding examples of this is not easy, and so far I have found only two. Both estimate velocities for travel to the Moon. Petar Bosnic Petrus, who claims to have built an experimental machine is one, and Leonard Cramp is the other.
I have chosen to use a computer program (dBase 111+) to calculate the velocities and distances at 1 second increments, shown on the screen in real time, and to store the results in a database for transfer to a spreadsheet program to create a graph. Shown below is a graph which uses the formula 9.8m/sec/sec with a time span of 540 seconds.