A trolley of mass $$200\,\text{kg}$$ carrying a sandbag of mass $$20\,\text{kg}$$ is moving on a frictionless horizontal track with speed $$36\,\text{km h}^{-1}$$. After a while, sand starts leaking out of the bag on the floor of trolley at the rate $$0.04\,\text{kg s}^{-1}$$. What is the speed of trolley after the entire sand bag is empty

A

$$8\,\text{m s}^{-1}$$

B

$$9.2\,\text{m s}^{-1}$$

C

$$10\,\text{m s}^{-1}$$

D

$$10.8\,\text{m s}^{-1}$$