A space craft flying in a straight course with a velocity of 75 kms^-1 fires it rocket motors for 6s .At the end of this time ist speed is 120 km s^-1 in same direction. 

find :

1. the spacecraft 's avg acceleration while motors were firing

2.the distance travelled by space craft in first 10 s after the rocket motor started , the motors have been in action for only 6s.