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In an ideal orthogonal cutting experiment (see figure), cutting velocity V = 1 m/sec, the rake angle of the tool =5, and the shear angle is known to be 45 Applying the orthogonal cutting model, consider two shear planes PQ and RS closed to each other. As they approach the thin shear zone (shown as a thick line in the figure) plane RS gets sheared with respect to PQ, (point R1 shears to R2, and S1 shears to S2). Assuming that the perpendicular distance between PQ and RS in 8=25 m. What is the value of shear strain (in S) that the material undergoes at the shear zone?