If an arrow is shot upward on Mars with a speed of 54 m/s, its height in meters t seconds later is given by y = 54t 1.86t2. (Round your answers to two decimal places.) (a) Find the average speed over the given time intervals. (i) [1, 2] m/s (ii) [1, 1.5] m/s (iii) [1, 1.1] m/s (iv) [1, 1.01] (v) [1, 1.001] m/s m/s (b) Estimate the speed when t = 1. m/s