I know that how to control a sphere move from here to there.
but how can I view the speed in this process.

I want to control its speed,make the variable speed,but I really don't know how to do it .

If I add a noise channel,it's only influence the displace.
the object may be move forward or backward.

I want to make the object still move forward,sometimes fast ,sometimes slowly.

Help me ,thanks everybody.