Particles A and Bare traveling counterclockwise around a circular track at a constant speed of 8 m/s. If at the instant shown the speed of A begins to increase by (a_t)_A = (0.4SA) m/s², where s_A is in meters, determine the distance measured counterclockwise along the track from B to A when t = 1 s. What is the magnitude of the acceleration of each particle at this instant?

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SA A r = 5 m 0 = 120° SB B