We can find the average force needed to cause the increase of rocket's velocity from the
impulse-momentum change equation:
here, "F_{avg}" is the average force needed to cause the increase of rocket's velocity,
"\\Delta t=3.10\\ s" is time during which the thrusters are fired, "m=3250\\ kg" is the mass of the rocket, "v_i=6.70\\ \\dfrac{m}{s}" is the initial velocity of the rocket, "v_f=10.5\\ \\dfrac{m}{s}" is the final velocity
of the rocket.
Then, from this equation we can calculate "F_{avg}":
Answer:
"F_{avg}=3984\\ N."
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