Kinematics plz.....very urgent

Dear Student,

(a) r = 4 c m, v = 1 c m / s T = \frac{2 π * 4}{1} = 8 π s (b) average speed = \frac{distance travelled}{time taken} = \frac{2 π}{T / 4} = 1 cm / s average velocity = \frac{displacement}{time} = \frac{\sqrt{2} r}{T / 4} = \sqrt{2} * 4 / 2 π = \frac{2 \sqrt{2}}{π} cm / s accn = \frac{v^{2}}{r} = \frac{1}{4} = 0.25 {cm}^{2} / s Regards