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]

m/s


(v) [1, 1. 001]

m/s



(b) Estimate the speed when t = 1.

m/s