A force platform measures the horizontal force exerted on a person's foot by the ground. In FIGURE 9-26 we see force-versus-time data taken by a force platform for a person who starts jogging at time t = 0. The impulse imparted to the jogger from t = 0 to t = 0.6 s is 198 N ∙ s.

(a) What is the average force exerted on the jogger from t = 0 to t = 0.6 s?

(b) If the jogger's change in speed during this time period is 2.69 m/s, what is the jogger's mass?

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750 500 250 0.3 Time (s) 0.5 0.1 0.2 0.3 0.4 0.6 Horizontal force (N)