B - you take your foot off the pedal and immediately you feel a change, as if you're braking;
Tesla says
Quote:
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Due to the simplicity of the AC induction motor’s single moving part, the Tesla Roadster does not experience the engine compression braking of a traditional internal combustion engine (ICE). Instead, the advanced algorithms in the motor controller give it complete control of the motor torque for both driving and regenerative braking. A torque command is derived from the position of the throttle pedal. The motor controller converts this torque command into the appropriate 3-phase voltage and current waveforms to produce the commanded torque in the motor in the most efficient way. The torque command can be positive or negative. When the torque serves to slow the vehicle then energy is returned to the battery and presto - we have regenerative braking!
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The thing also has regular brakes but you hardly have to use them. You can slow down just with the "gas" pedal (now the "torque command" pedal I guess) and throw all that energy back into the battery!