4. Calculate average speed of particle which position at time t is given by the function g(t) = t3, on the intervals

(a) [2,3]; (b) [2,2.1];
(c) [2,2.0001];
(d) [2, 2 + h] , where h > 0 is arbitrary positive number.
Find g′(2).

Never mind I have solved the question