The position of a particle according to the appropriate coordinate set can be vectorially specified in meters as r = i(sin2nt) – 16j(1 – e¯t/*) + kt²/4 where t is the movement time of particle in seconds after passing its origin. If the mass of the particle is 2 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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