Question

Suppose a train is moving along a straight railway and the distance s (in meters) traveled...

Suppose a train is moving along a straight railway and the distance s (in meters) traveled after t minutes is given by the function:

?(?)=?2+2?+3

a) The average velocity of the train between 1 and 9 minutes is :
(b) The instantaneous velocity of the train when t = 9 is :

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