The position of a person riding in a motorcycle race is give by $s(t)=4t^2+3t$, where $t$ measures time in seconds since the race began, and position is measured in feet beyond the starting line. Determine the average velocity of the motorcycle rider on the interval $[1,4]$. Include units in your answer.
My answer that I got is $20.33$ m/sec but a friend is getting a different answer.
I think you are wrong
correct answer is 23
average velocity = change in displacement /time taken