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4. The position vector of a particle of mass m varies with time according to the equation d2 i Find() and the net force acting on the particle at time dt Find also the power P due to the net force at time [10 marks] (ii) By using (), find the work done by the net force on the particle within the period t = 0 to t-r, where r is the time when the particle comes to rest. [10 marks

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