2. A 10-g bullet is fired horizontally into a 10-kg block of wood suspended by a rope from the ceiling. The block swings in an arc, rising 1 cm above its lowest position. Approximately, what is the incident velocity (in unit of m/s) of this bullet?
(A) 300
(B) 350
(C) 400
(D) 450
(E) 500

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