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MOTION IN A PLANE
a plane, we need to choose a convenient point, say O as origin. Let P and P ′ be the positions of the object at time t and t′, respectively [Fig. 4.1(a)]. We join O and P by a straight line. Then, OP is the position vector of the object at time t. An arrow is marked at the head of this line. It is represented by a symbol r, i.e. OP = r ...
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