a space craft is flying in a straight course with the velocity of 75 km/s fires its rocket motors for - Physics -

Question

a space craft is flying in a straight course with the velocity
of 75 km/s fires its rocket motors for 6 s At the end of the time
its speed is 120km/s in same direction find (I) space craft's
average accelertion while motors is firing(I)the distance travellrd
by space craft in first 10 secafter the rocket motors were started
, the motors have been in action only for 10 sec

Jyoti Pant · Accepted Answer

Solution: Here initial velocity u=75km/s,final velocity v=120km/s time t=6 sec 1-Average acceleration=change in velocity/time interval =(120-75)/6=7 5 $k m / s^{2}$ 2-Distance travelled by the spacecraft $s = u t + \frac{1}{2} a t^{2} = 75 \times 10 + \frac{1}{2} \times 7 5 \times 10^{2} = 750 + 375 = 1125 k m$