A particle moves on a line away from its initial position so that after t hours it is s = 6t^2 + 2t miles from its initial position. Find the average velocity of the particle over the interval [1, 4]. Include units in your answer.

Question

phi · Answer

find s when t is 1
then find s when t is 4

average speed will be the distance traveled divided by the time
the time is 4-1 = 3 hours

anonymous · Answer

why do you just subtract 4 from 1??

phi · Answer

interval [1, 4]
means from time 1 to time 4
that means the length of this interval is 4-1 = 3 hours