## Physics (10th Edition)

6.9 m/$s^{2}$
period = 0.4 $\times$ 4 = 1.60 s v = $\frac{distance}{time}$ = $\frac{2 \times π \times 0.45}{1.60}$ $\approx$ 1.77 m/s a = $\frac{v^{2}}{r}$ = $\frac{1.77^{2}}{0.45}$ $\approx$ 6.9 m/$s^{2}$