A particle P moves on the number line shown in part (a) of the accompanying figure. Part (b) shows the position of P as a function of time t. s (cm) (a) s (cm) s = f(t) t (sec) 5 6 2 4 -2 (6, –4) -4 (b) a. When is P moving to the left? Moving to the right? Standing still? b. Graph the particle's velocity and speed (where defined). 3.

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