A particle moves in a circle of radius 25 cm at two revolutions per sec. The acceleration of the particle in $\mathrm{m}/{\mathrm{s}}^2$ is:

r = 25 $\times {10}^{-2} \mathrm{m}, \mathrm{f} = 2 /\sec$

       $\mathrm{\omega } = 2\mathrm{\pi f}= 4\mathrm{\pi } \mathrm{rad}/\sec$

Acceleration = ${\mathrm{\omega }}^2 \mathrm{r} = {\left(4\mathrm{\pi }\right)}^2\times 25\times {10}^{-2}$

                   = 16$\times$25$\times$${10}^{-2}{\pi }^2$$\mathrm{m}/{\mathrm{s}}^2$

                    = 4${\pi }^2$ $\mathrm{m}/{\mathrm{s}}^2$