A spacecraft engine creates 55.1 MN of thrust with a propellant velocity of 4.88 km/s. (a) Find the rate (dm/dt) at which the propellant is expelled. (b) If the initial mass is 2.08 x 10^6 and the final mass is 6.78 x 10^4 kg, find the final speed of the spacecraft (assume the initial speed is zero and any gravitational fields are small enough to be ignored). (c) Find the average acceleration till burnout (the time at which the propellant is used up; assume the mass flow rate is constant until that time).