The velocity of a bullet is reduced from 200m/s to 100m/s while travelling through a wooden block of thickness 10cm. The retardation, assuming it to be uniform, will be [AIIMS 2001]

• A.             \[10\times {{10}^{4}}\] m/s2           
• B.             \[12\times {{10}^{4}}\] m/s2
• C.             \[13.5\times {{10}^{4}}\] m/s2        
• D.             \[15\times {{10}^{4}}\] m/s2