A rock is rolled down a 600-foot steep incline. After 1 second, the rock is traveling 22 feet per second. After 5 seconds, the rock is traveling 112 feet per second. Assume that the relationship between time, t, and speed, s, is linear and write an equation in slope-intercept form describing this relationship. Use ordered pairs of the form (time, speed).
Use this equation to determine the speed of the rock 6 seconds after it was rolled.