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