During the first 3.0s of flight, the engine of a small model rocket expels exhaust gases backward with a steady force of 1.5×104N.
Answer the following questions.
a. Determine the magnitude and direction of the force exerted on the rocket by the exhaust gases during this interval.
b. Calculate the magnitude of the impulse delivered to the rocket by the exhaust gases over the 3.0s interval. Express the answer with units.