\begin{problem*}{2.5}
A position-time graph for a particle moving along the $x$ axis is
-shown in Figure P2.5. \Part{a} Find the average velocity in the time
+shown in Figure~P2.5. \Part{a} Find the average velocity in the time
interval $t=1.50\U{s}$ to $t=4.00\U{s}$. \Part{b} Determine the
instantaneous velocity at $t=2.00\U{s}$ by measuring the slope of the
tangent to the graph. \Part{c} At what value of $t$ is the velocity