#### Motor Daddy

**Valued Senior Member**

Nonsense. It is NOT relevant, and the maths DOES add up: speed of treadmill backward (relative to fixed frame) + movement speed of craft forwards (relative to fixed frame) = effective movement speed of craft on a flat length of static road. If in 1 second the car moves 1ft forward while the belt moves 2 ft back, the effective speed of the craft if it were on a flat road is 3 ft/s. Oh, look at that: it all adds up, mathematically!

Laughing my ass off!

If in 1 second the car moves 1 foot then the speed of the car is 1 ft/sec. If the belt moves back 2 ft in 1 second then the speed of the belt is 2 ft/sec. The belt is 1 ft/sec FASTER than the car.

The CLOSING SPEED is 3 ft/sec, which is not a speed of one of the objects, it is a change in distance between the two objects over a duration of time! That is not a speed of an object!

"IF IT WERE ON A FLAT ROAD..." Laughing my ass off! How fast is the road going? If the road is going 3 ft/sec, and the car is going 3 ft/sec then the closing speed is 0 ft/sec. So the car on the road is not moving compared to the road! Unless of course you are claiming the CLOSING SPEED is 3 ft/sec, but you weren't talking about closing speed were you? "Nobody here is talking about closing speed." (rolls eyes)

You mix frames like it's going out of style! It is MORONIC to say "

**IF**it were doing this then that." OUT-F'n-RAGEOUS!

, my time of taking you seriously is unfortunately at an end.

See Ya! Hopefully you learn that 2 ft/sec is FASTER than 1 ft/sec. But I won't hold my breath!

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