The displacement (in feet) of a certain particle moving in a straight line is given s=t^3/8 by where t is measured in seconds. Find the average velocity over the interval (1, 1.8)
Avg velocity is
[ s(8) - s(1) ] / [ 8 - 1 ]
So we have
[ 8^3 / 8 - 1^3/8 ] / 7 =
[64 - 1/8] / 7 =
73/8 ft / s = 9.125 ft / s
+61 
