A tram driver sees a hazard on the track. The driver's reaction time is 0.80 s. From the moment the driver sees the hazard, the tram travels a total of 40 m before it stops. 30 m of this is travelled after the brakes are applied.
What was the speed of the tram when the driver saw the hazard?
37.5 m/s37.5\ \mathrm{m/s}37.5 m/s
50.0 m/s50.0\ \mathrm{m/s}50.0 m/s
12.5 m/s12.5\ \mathrm{m/s}12.5 m/s
8.0 m/s8.0\ \mathrm{m/s}8.0 m/s