13. The position vector of a particle at time t is R = cos (t – 1) i + sinh (t – 1) j+ atk. If at t = 1, the acceleration of the particle be perpendicular to its position vector, then a is equal to (a) 0 (b) 1 1 (c) (d) JE (AMIETE, Dec. 2009) Ans. (d)

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