A chain of roller coaster cars moving horizontally comes to an abrupt stop and the passengers are accelerated by their safety harnesses. In one particular car in the chain, the car has a mass M = 122 kg, the first passenger has a mass m1 = 55.2 kg, and the second passenger has a mass m2 = 68.8 kg. If the chain of cars slows from 26.5 m/s to a stop in 4.73 s, calculate the average magnitude of force exerted by their safety harnesses on (a) the first passenger and (b) the second passenger.
(a)___N
(b)___N