A particle moves on a predetermined trajectory with the equation of motion (s(t)=k t^{2}), with (k) constant

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A particle moves on a predetermined trajectory with the equation of motion \(s(t)=k t^{2}\), with \(k\) constant and with magnitude of the acceleration equal to \(a=2 k\). Show by using (3.74) that the radius of curvature is given by the relation \(ho=\frac{v^{2}}{\sqrt{a^{2}-\stackrel{s}{s}^{2}}}\). Show that in the present case the motion is rectilinear.

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