Find the speed of a bullet after it emerges from a bloc if it enters into the hanging block of mass 2 kg (hang from a string of lengh 5 m ) and due to it, block raise vertical distance of 0.2 m. (mass of bullet =0.01k striking speed of bullet =500 m/s,g=10 m/s S2)

A. 15 m/s
B. 20 m/s
C. 100 m/s
D. 50 m/s