Page "Bussard ramjet" Paragraph 4

An object's velocity can be calculated by summing over time the acceleration supplied ( ignoring the effects of special relativity, which would quickly become significant at useful interstellar accelerations ).

If a ramjet could accelerate at 10 m / s < sup > 2 </ sup >, slightly more than one Earth gravity, it would attain 77 % of light velocity within a year.

However, if the ramjet has an average acceleration of 0. 1 m / s < sup > 2 </ sup >, then it needs 100 years to go as fast, and so on.