>>1440718>railgunA railgun has a muzzle velocity of about 2000 m/s. If try to shoot down a sattelite, we'd need to shoot nearly vertivcally. Let's make an idealised situation where the target is directly above the railgun and air resistance doesn't matter.
h=v^2/(2*g)
g=9.81 m/s^2
h=2000^2/(2*9.81)=203873,60 m=203.87 km
Low earth orbit starts at 2000 km. You'd need a railgun at least 3 times more powerful than any current railgun, a guidance system advanced enough to shoot down a moving sattelite at that distance, and that's under ideal conditions.
It's probably easier to build a powerful enough MASER to shoot it down. Maybe multiple less powerful MASERs at different locations, controlled by a single computer.
