Aspaceship at rest relative to a nearby star in interplanetary space has a total mass of 2.60 ✕ 104 kg. its engines fire at t = 0, steadily burning fuel at 76.0 kg/s with an exhaust speed of 4.50 ✕ 103 m/s. calculate the spaceship's acceleration at t = 0, mass at t = 115 s, acceleration at t = 115 s, and speed at t = 115 s, relative to the same nearby star.

(a) acceleration at t = 0 (enter the magnitude. enter your answer in m/s2.)
(b) mass at t = 115 s (enter your answer in kg.)
(c) acceleration at t = 115 s (enter the magnitude. enter your answer in m/s2.)
(d) speed at t = 115 s (enter your answer in m/s.)