A small block slides down a frictionless track whose shape is described by y = (x^2) /d for x<0 and by y = -(x^2)/d for x>0. The value of d is 2.35 m, and x and y are measured in meters as usual. Suppose the block starts from rest on the track, at x = -2.36 m. What will the block s speed be when it reaches x = 0?     8.18 m/s     6.82 m/s     4.82 m/s     1.45 m/s

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