For a vehicle travelling at speed $v$, if a constant braking force is exerted, the distance $d$ travelled as it comes to rest is described by $d = kv^2$, where $k$ is a constant. If $d$ is given in metres and $v$ is given in metres per second, the constant takes the value $k_1$. When the distance is measured in metres and the speed is measured in kilometres per hour, what is the value of the constant?
- A$0.0772k_1$
- B$0.278k_1$
- C$3.60k_1$
- D$13.0k_1$