Tony wrote:

cjcampbell wrote

If the car's airspeed indicator said 60 then the speedometer will
indicate 120. But the car would then need to expend the same energy to
accelerate to 60 as it would to accelerate to 120 on a stationary road.

Wrong. The energy required to spin the wheels at 120 MPH isn't at all
the same as that required to accelerate the entire car to 120 MPH.


Matt