From experiments, the time variation of the vertical force on a runner’s foot as he strikes and pushes off the ground is shown in the graph. These results are reported for a 1-lb static load, i.e., in terms of unit weight. If a runner has weight W, determine the approximate vertical impulse he exerts on the ground if the impulse occurs in time t₅.

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Units Used: ms = Given: 10-3 10 W = 175 lb t1 = 25 ms S t = 210 ms