OK - I'll start.
Assume you can throw a tennis ball at 50 mph
You are on an airliner travelling at 500 mph
You throw the ball from the back of the cabin to the front.
Was the ball doing 550 mph ?
If so, when you throw it back down the cabin was it actually doing 450 mph forwards ?
If the stewardess caught it mid flight on the way back, did it stop or did it accelerate instantly to 500 mph ?
I'm off for a bike ride now. See you later......
:-)
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