Answer
$s(1) = 0$
The object is moving upward at time $t=1$.
Work Step by Step
$s(t) = -3~cos~2.5\pi t$
When $t = 1$:
$s(1) = -3~cos~[(2.5\pi) (1)] = -3(0) = 0$
On the graph, we can see that the slope of the graph is positive at time $t = 1$. Therefore, the object is moving upward at time $t=1$.