Refer to the adjacent figure. A variable force F is applied to a body of mass $$6\text{ kg}$$ at rest. The body moves along the x axis as shown. The speed of the body at $$x=5\text{ m}$$ and $$x=6\text{ m}$$ is

A

$$0\text{ m/s},0\text{ m/s}$$

B

$$0\text{ m/s},2\text{ m/s}$$

C

$$2\text{ m/s},2\text{ m/s}$$

D

$$2\text{ m/s},4\text{ m/s}$$