A $2.0\,\text{kg}$ mass is at rest on a frictionless surface. It is connected to a $1.0\,\text{kg}$ mass by a light, thin string that runs over a frictionless pulley. The $1.0\,\text{kg}$ mass is let go and accelerates downward. What is the speed of the $2.0\,\text{kg}$ mass when the $1.0\,\text{kg}$ mass reaches the floor, after descending $0.50\,\text{m}$?
- A$1.8\,\text{m s}^{-1}$
- B$2.2\,\text{m s}^{-1}$
- C$3.1\,\text{m s}^{-1}$
- D$9.8\,\text{m s}^{-1}$