A buttle weighting 10 g and moving with a velocity `800 ms^(-1)` strikes a 10 kg block resting on a frictionless surface. The speed of the block after the perfectly inelastic collision is approximately
A. `8 cm s^(-1)`
B. `80 cm s^(-1)`
C. `8 ms ^(-1)`
D. `0.8 cm s^(-1)`