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Physics Suppose the position vector for a particle is given as a function of time by r() = x(ri + y(fjj, with a[) = at + b and y(t) = ct- + d, where a = 1.50 m/s, b = 1.15 m, c = 0.135 m/s', and # = 1.02 m. (a) Calculate the average velocity during the time interval from . = 2.15 s to r = 4.10 s. m/s (b) Determine the velocity at . = 2.15 s. m/s Determine the speed at f - 2.15 s. m/s