A bullet of mass \[{{m}_{1}}\] is fired into a block mass \[{{m}_{2}}\] suspended like a pendulum. The block, initially at rest, is raised to a height h, after the impact. The velocity of the bullet is

• A.  \[\left( 1+\frac{{{m}_{1}}}{{{m}_{2}}} \right)\sqrt{gh}\]
• B.         \[\frac{{{m}_{1}}}{{{m}_{2}}}\sqrt{2gh}\]
• C.  \[\left( 1+\frac{{{m}_{1}}}{{{m}_{2}}} \right)\sqrt{2gh}\]
• D.         \[\left( 1+\frac{{{m}_{2}}}{{{m}_{1}}} \right)\sqrt{2gh}\]