3.79 A rod is pinned at A and B to the centers of two small rollers. (See Figure P3.79.) The spe

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3.79 A rod is pinned at A and B to the centers of two small rollers. (See Figure P3.79.) The speed of A is kept constant at $v_0$ even after B encounters the parabolic surface. Find the acceleration of B just after its roller begins to move on the parabola.