What is the speed of a car travel when the brake is not applied?

a) depends on how fast it was going when the brakes were lifted

b) depends on if going up or down a hill

c) depend on if gearshift is in neutral or drive.

Impossible to say with the information provided.

@elbanditoroso From a stopped car. On a flat road. In drive.

I drive a standard. Zero

Given your conditions, I’d guess 0 mph, but some cars may start moving and get up to 1 mph.

Is engine on?
Is the wind blowing? What speed and which direction?
What is the temperature and barometric pressure.
Raining, snowing, sunny?

@gondwanalon Yes. No. No. Normal. Sunny.