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This revised edition in SI System of units contains new topics on: Product of Inertia; Since the use of vector methods is being encouraged, infact, spatial problems are best solved by vector analysis. Consequently method of such problem by using vectors has been explained; The use of vector calculus has been demonstrated for obtaining formulae for velocities and accelerations of a particle moving in a curve; Friction part has been further enlarged by adding the nature of fricion and rolling friction; Free vibrations, damped vibrations and forced vibrations has bee included; Also motion curves gives method of drawing v-t and s-t curves, when the a-t curve is given; The method of forming differential equations of motion and their solutios has been fully explained; Numerous objective type questions and short questions are also added apart from many fully solved problems taken from various engineering colleges.