In deep space, a 636 kg space probe, travels with an initial velocity of 19 m/s. Retro-rockets fire, producing a 212 N force in the opposite direction of the probe's initial velocity. How many seconds until the probe has a velocity of 22 m/s in the opposite direction of the initial velocity?

impulse=change momentum

212*time=636(19=(-22))

time= 636(41)/212 seconds