Mrs. Clark (m = 66kg) is dreaming about when the pandemic is over and she can travel someplace foreign. While she is on a Boeing 777-200 with a mass of 200,000 kg that is flying at its cruising speed of 251 m/s, Mrs. Clark gets up to use the bathroom. She walks
towards the back of the plane at a speed of 2 m/s.
a) Will the airplane speed up or slow down as a result of Mrs. clark motion?
b) How much does the airplanes speed change as a result of Mrs. Clarks walk to the back of the plane? please give answer with units of meters per second !

i’m not sure how to figure this out! please give a step by step explanation. WILL GIVE BRAINLIEST!