The coefficient of friction between a body and the surface of an inclined plane at 45° is 0.5. If \[g=9.8\,m/{{s}^{2}}\], the acceleration of the body downwards in \[m/{{s}^{2}}\] is [EAMCET 1994]

• A.                         \[\frac{4.9}{\sqrt{2}}\]                      
• B.                         \[4.9\sqrt{2}\]            
• C.                         \[19.6\sqrt{2}\]            
• D.                         4.9