Accelerration is the change of speed faster/slower.
69 mphIt can be any speed but probably about 60 mph
well it depends. You should always get to know the person well enough that you're very comfortable around them and then you marry them. there's no "steps" in a relationship. You get to know...
Run every day. Monday, run 1/2 mile, jog 1/2 mile. Tuesday, run 1 mile, jog 1 mile, and so on.