The position of a particle according to the appropriate coordinate set can be vectorially specified in meters as r=i(sin2πt)- 16j(1-e^((-t)⁄4) )+kt^2/4 where t is the movement time of particle in seconds after passing its origin. If the mass of the particle is 2.1 kg, calculate the x component of its R force and the magnitude of its resultant force R at time t = 4s.
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