The position of a hummingbird flying along a straight line in t seconds is given by s(t) = 3t - 7t meters for t 2 0. (a) Determine the velocity of the bird (in m/s) at t = 1 s. 2 m/s (b) Determine the acceleration of the bird (in m/s ) at t = 1 s. m/s2 (c) Determine the acceleration of the bird (in m/s ) when the velocity equals 0. (Round your answer to two decimal places.) m/s2