JEE Main Physics question

The velocity of a bullet is reduced from 200 m/s to 100 m/s while travelling through a wooden block of thickness 10 cm. The retardation, assuming it to be uniform, will be [AIIMS 2001, RPMT 2006]

• (A) m/s
• (B) m/s
• (C) m/s
• (D) m/sCorrect