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2015-09-10T23:08:37+05:30

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During the time the engine fires, there is an acceleration of the spaceship.  Once, engine is off, the spaceship moves with a constant velocity.

a = ( v - u ) / t
a = (60 - 50) /10 = 1 km/s²

distance travelled in the first 10 sec. = s1 = u t + 1/2 a t²  or (v + u)/2 * t
       s1 = 550 km
distance travelled in 20 sec. after engine firing is over = 60 km/s * 20 s
     s2 = 1, 200 km

Total distance travelled = 1, 750 km

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