8. A bullet (mass=m) is fired at speed v into a block of mass M (with M> m) which is hanging
vertically from a light string of length L. The bullet is embedded in the block. If the recoiling
block-bullet system reaches a height of 2/3L, then the initial speed of the bullet is most nearly
a
Mx (1gL/3)1/2/m
b Mx (2gL/3)¹/2/m
C. Mx (3gL/4)¹/2/m
d. Mx (4gL/3)¹/2/m
