A particle starts from rest at O and moves along a horizontal semicircular track OAB of radius R = 1m as shown in the fig. The rate of change of speed of the particle is constant and equals to 2m/s2. A is a point lying exactly on the middle of the semi-circle track as shown in the fig. When the particle reaches A. Find The magnitude of velocity vector of the particle at the instant.

Dear Student,
Your question seems to be incomplete since no figure is provided in the question.Moreover, this is the vector based question so we can not imagine the location of point, and this will greatly  affect the answer observed.
So we request you to please post the image related to the question so that we can help you out.

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