2-10.  In Problem 2-7, assume in each part that the initial position occurs when the jogger's stopwatch reads 30 s and the final position occurs when the watch reads 280 s.

a.   Find the jogger's average velocity and average speed in Problem 2-7a. b.   Find the jogger's average velocity and average speed in Problem 2-7b. c.   Find the jogger's average velocity and average speed in Problem 2-7c. d.   Find the jogger's average velocity and average speed in Problem 2-7d. e.   The jogger's speed when the watch reads 100 s (is 0.5 m/s; is −0.5 m/s; is 2 m/s; is −2 m/s; is 5 m/s; is −5 m/s; or cannot be calculated).

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