$$ a = - \omega^2 r→ $$
That’s means a→ points towards the middle of the circle.
Formula:
$$ \omega → = \frac{2 \pi \ rad}{t} $$
$$ c= 2 \pi \ rad\ r $$
$$ kg \ m^2 \ rad/s^2 \\ =\frac {kg\ m^2} {s^2} \\= \frac {kg \ m}{s^2} m\\=Nm $$
