Zinaida semenova set the course record for the twin cities marathon in 2001. she ran the 26.2 miles in a little less than 2.45 hours. starting from rest, how long did it take her to reach her average velocity of 10.69 miles/hour if her acceleration was 2.18 m/s/s?

Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.