A diagram illustrates a pendulum. It moves from P to Q to R and then back to P. P is $10\,\text{cm}$ above Q. At what speed does the pendulum bob pass through Q?
- A$0.44\,\text{m s}^{-1}$
- B$1.0\,\text{m s}^{-1}$
- C$1.4\,\text{m s}^{-1}$
- D$2.0\,\text{m s}^{-1}$