$1.3.23.$ A small body moves at a constant velocity $v$ along a trajectory consisting of two smoothly connected arcs of circles of radius $R$ and $\frac{R}{3}$. Plot the acceleration vectors at the marked points of the trajectory.
Acceleration is directed along the radius-curvature of the trajectory and is equal to
$$ \fbox{$ a = \frac{v^2}{r}$} $$
See figure