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A uniform plank of Young’s modulus Y is moved over  a smooth horizontal surface by a constant horizontal force F. The area of cross section of the plank is A. The compressive strain on the plank in the direction of the force is

(a) $F/AY$                       (b) $2F/AY$

(c) $\frac{1}{2}\left(F/AY\right)$                 (d) $3F/AY$