If a vehicle is said to be accelerating at 2G, then it is accelerating at a rate double that of the acceleration due to gravity. In metric units, on earth, a 2G acceleration would be an acceleration of 2 x 9.81 M/s/s, or 19.62 M/s/s. As a gross rule of thumb, acceleration rates in road vehicles (whether in straight line or around corners) tend to be fractions of 1G, with accelerations higher than that considered very high performance. In collisions, accelerations can be 50 times (or more) higher.
I don't know if any of that is even vaguely related to your question. Were you thinking about this planet vs other planets?
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Gravity
Re: Gravity
