[Campion]

Force x distance is energy. Energy per unit time is power. One newton over a distance of one meter every second is one watt. One horsepower is just under 746 watts.

5.4 newtons of force isn't much. Still, in space, where there's no friction loss, 5.4 newtons applied to one ton of mass for a week gives it another 1600 mph of velocity.

[ak267]

NASA first developed nuclear propulsion from 1965-1972 under the NERVA Project.

Scientists were so ecstatic with the results they boasted of sending astronauts to Mars in 1980 and Saturn in 1990.

WIKI
https://en.wikipedia.org/wiki/NERVA

[DarthFuzball]

How fast is that in Furlongs per Fortnight?