Convert a disfluent question to a proper question. A disfluent question is a question that has some interruptions in it while framing. A proper question is the correct form of the question without any disfluency.
One example: Why was uh where was the Rhine regulated with an upper canal?
Solution is here: Where was the Rhine regulated with an upper canal?
Explanation: The above disfluent question is correctly converted to a proper question. The 'uh' and the 'why' before the correction should be removed to make it fluent.

Now, solve this: Which physics er who concluded that motion in a constant velocity was completely equivalent to motion?
Solution:
Who concluded that motion in a constant velocity was completely equivalent to motion?