Animal A and animal B walk at the same preferred/optimal speed despite the fact that animal A has twice the body mass of animal B.

Animal A and animal B walk at the same preferred/optimal speed despite the fact that animal A has twice the body mass of animal B. If animal B has a contact angle (2α) of 60 degrees, what would the contact angle of animal A have to be?
Answer: The contact angle is 52.7 degrees
In order to gain full credit, you need to show your work, including a listing of (1) the governing equations, (2) all parameters and variables, (3) all necessary assumptions, (4) the steps to finding the solution, with a descriptive sentence.
 
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