The acceleration of a particle moving only on a horizontal xyplane is given by vector a=3ti +4tj, where vector a is in metersper second-squared and t is in seconds.At t=0, the position
vector r = (20.0m)i + (40.0m)j locates the particle,which thenhas the velocity vector v=(5.00m/s)i + (2.00m/s)j. Att=4.00s, what are (a) its position vector in unit-vector notationand (b) the angle between its direction of travel and the positivedirection of the x-axis?

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