What would be a sensible estimate for the momentum of a family car moving at $25\ \text{kilometres per hour}$?
- A$1 \times 10^4\ \text{kg m s}^{-1}$
- B$1 \times 10^5\ \text{kg m s}^{-1}$
- C$1 \times 10^6\ \text{kg m s}^{-1}$
- D$1 \times 10^7\ \text{kg m s}^{-1}$