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11-99.

An object is moving in a straight line such that its distance traveled after $t$ minutes is $s = - \operatorname { ln } ( \frac { 1 } { t + 1 } )$ meters.

1. Find its average velocity over $0 ≤ t ≤ 3$.

First, graph the equation and make sure the object does not change directions.
average velocity $=$ (total distance)/(total time)
total distance $= s(3)-s(0)$

2. Find the acceleration of the object at $t = 2$ minutes.

$s(t) =\operatorname{ln}(t + 1)$