8. A motorcycle accelerates from rest along a straight road with position function s(t) = t + t, where s(t) is measured in meters and

8. A motorcycle accelerates from rest along a straight road with position function s(t) = t³ + t, where s(t) is measured in meters and t is measured in seconds.a) What is the average velocity of the motorcycle between 1 and 6 seconds?b) What is the velocity of the motorcycle at 4 seconds?