28. (a) Could a particle moving with instantaneous speed $3.00 m / s$ on a path with radius of curvature $2.00 m$ have an acceleration of magnitude $6.00 m / s ^{2} ?$ (b) Could it have $|\overrightarrow{ a }|=4.00 m / s ^{2} ?$ In each case, if the answer is yes, explain how it can happen; if the answer is no, explain why not.

 28. (a) Could a particle moving with instantaneous speed $3.00 m / s$ on a path with radius of curvature $2.00 m$ have an acceleration of magnitude $6.00 m / s ^{2} ?$ (b) Could it have $|\overrightarrow{ a }|=4.00 m / s ^{2} ?$ In each case, if the answer is yes, explain how it can happen; if the answer is no, explain why not.