Subject: How do power and torque combine to provide acceleration and top speed?

Although I think I understand how torque provides acceleration is top
speed on, say, a motorcycle governed by its power output while the 
torque output only determines how fast the bike gets to its top speed?
P.S. I've read the answer to "How does horsepower compare to torque" 
but I'm still a little in the dark.

Thanks for your patience. 

Re: How do power and torque combine to provide acceleration and top speed?