A graph of v(t) is shown for a world-class track sprinter in a 100-m race. (See...

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A graph of v(t) is shown for a world-class track sprinter in a 100-m race. (See figure below). Runner Velocity vs. Time 14 12 #2086 Velocity (m/s) 420 0 2 4 8 10 12 Time (s) (a) What is his average velocity (in m/s) for the first 4 s? m/s (b) What is his instantaneous velocity (in m/s) at t = 8 s? m/s (c) What is his average acceleration (in m/s) between 0 and 4 s? m/s (d) What is his time (in s) for the race? S A graph of v(t) is shown for a world-class track sprinter in a 100-m race. (See figure below). Runner Velocity vs. Time 14 12 #2086 Velocity (m/s) 420 0 2 4 8 10 12 Time (s) (a) What is his average velocity (in m/s) for the first 4 s? m/s (b) What is his instantaneous velocity (in m/s) at t = 8 s? m/s (c) What is his average acceleration (in m/s) between 0 and 4 s? m/s (d) What is his time (in s) for the race? S