Originally Posted by Obscurum per obscurius
Since the mid 90s V1 has been redefined, it is no longer a failure speed or a decision speed it is an action speed. Simple!
"The maximum speed in the takeoff at which the pilot must TAKE THE FIRST ACTION to stop the airplane within the accelerate/stop distance.”
It also states: "V1 also means the minimum speed in the takeoff, following the failure of an engine at which point the pilot can continue the takeoff and achieve the required hight above the takeoff surface within the takeoff distance"
Also when the AFM is produced all the figures are predicated on a failure 1 second before V1
So to answer the question you need to know the acceleration rate of the aircraft. Which is why its a naff question!