d A running track at Harvard University uses a surface with a force constant of 2.5 * 105 N>m. Thissurface is compressed slightly every time a runner’s foot lands onit. The force exerted by the foot, according to the Saucony shoecompany, has a magnitude of 2700 N for a typical runner. Treating the track’s surface as an ideal spring, find (a) the amount ofcompression caused by a foot hitting the track and (b) the energystored briefly in the track every time a foot lands.

d A running track at Harvard University uses a surface with a force constant of 2.5 * 105 N>m. Thissurface is compressed slightly every time a runner’s foot lands onit. The force exerted by the foot, according to the Saucony shoecompany, has a magnitude of 2700 N for a typical runner. Treating the track’s surface as an ideal spring, find (a) the amount ofcompression caused by a foot hitting the track and (b) the energystored briefly in the track every time a foot lands.

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