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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 { t }_{ 5 } . Units Used: ms = { 10 }^{ −3 } s Given: W = 175 lb , { t }_{ 1 } = 25 ms , t = 210 ms , { t }_{ 2 } = 50 ms , { t }_{ 3 } = 125 ms , { t }_{ 4 } = 200 ms , { t }_{ 5 } = 210 ms , { F }_{ 2 } = 3.0 lb , { F }_{ 1 } = 1.5 lb

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