A spaceship at rest relative to a nearby star in interplanetary space has a total mass of 2.00 ✕ 104 kg. Its engines fire at  t = 0,  steadily burning fuel at 79.3 kg/s with an exhaust speed of 4.50 ✕ 103 m/s. Calculate the spaceship's acceleration at  t = 0,  mass at  t = 135 s,  acceleration at  t = 135 s,  and speed at  t = 135 s,  relative to the same nearby star. HINT (a) acceleration at  t = 0  (Enter the magnitude. Enter your answer in m/s2.)  m/s2 (b) mass at  t = 135 s  (Enter your answer in kg.)  kg (c) acceleration at  t = 135 s  (Enter the magnitude. Enter your answer in m/s2.)  m/s2 (d) speed at  t = 135 s  (Enter your answer in m/s.)  m/s

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