The equation of motion of a point along a straight line has the form: x = 4 2t t^2 0.2t^3. Find: a) the position of the point at the moment of time: t1=2s and t2=5s; b) the average speed for the time elapsed between these moments; c) instantaneous speeds in a specified period of time; d) instantaneous accelerations in a specified period of time.

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