The acceleration of the rocket would be 150 m/s^2.
Initial velocity, u=1000 m/s
Final velocity, v=2500 m/s
Time taken, t=10 seconds.
According to equation of motion,
v=u+at
2500=1000+10a
2500-1000=10a
1500=10a
a=150 m/s^2.
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