In April 1974, Steve Prefontaine completed a 10 km race in a time of 27 min , 43.6 s . Suppose "Pre" was at the 7.15 km mark at a time of 25.0 min . If he accelerated for 60 s and then maintained his increased speed for the remainder of the race, calculate his acceleration over the 60 s interval. Assume his instantaneous speed at the 7.15 km mark was the same as his overall average speed up to that time.

Question

In April 1974, Steve Prefontaine completed a  10 km  race in a time of  27 min ,  43.6 s . Suppose "Pre" was at the  7.15 km  mark at a time of  25.0 min . If he accelerated for  60 s  and then maintained his increased speed for the remainder of the race, calculate his acceleration over the  60 s  interval. Assume his instantaneous speed at the  7.15 km  mark was the same as his overall average speed up to that time.

I was unsure how to do this but I attempted it about 4 times. The answers I calculated are 0.00397, 5.1, 4.9, and 0.006.

bobpursley · Answer

Use this as a sample problem: https://answers.yahoo.com/question/index?qid=20140117202925AA400ns