We consider the angular response to a unit step input force f(t). we observe that the unit step response θ(t) is oscillatory with the following properties: i) the angular displacement θ(t) reaches a maximum value θmax = 6 deg ii) the angular displacement θ(t) converges to a steady-state value θss = 4 deg when t → [infinity]. using this information, determine the values of the mass m and the rotational damping coefficient br.

Distance covered = speed x timethe distance traveled going against the stream = distance traveled with the stream.therefore it is the speed and the time that are the variables.as he travels the same distance both ways, speed x time is the same for each way.going upstream his speed is 4 kph; going downstream his speed is 6 kph.therefore we have two simultaneous equations: time upstream x 4 = time downstream x 6time upstream + time downstream = 60 minutestherefore we have the equation: time upstream = 6/10 hour, time downstream therefore = 4/10 hour.distance traveled at 4km/hr in 6/10 hour = 24/10 = 2.4km.check: distance traveled at 6km/hr in 4/10 hour = 24/10 = 2.4km.