The world needs a new source of energy, an unspillable source.

can somneone please help me with this homework.. its due today please help me?

NASA has developed Deep-Space 1 (DS-1), a spacecraft that is scheduled to rendezvous with the asteroid named 1992 KD (which orbits the sun millions of miles from the earth). The propulsion system of DS-1 works by ejecting high-speed argon ions out the rear of the engine. The engine slowly increases the velocity of DS-1 by about 19.0 m/s per day.
(a) How much time (in days) will it take to increase the velocity of DS-1 by 13600 m/s?
____days
(b) What is the acceleration of DS-1 (in m/s2)?
_____m/s2

( I know part A but i cant find the answer for part B )