What Determines the Maximal Angle in a Collision Between Unequal Masses?

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A mass M collides with a stationary mass m. If M < m, then it is possible for M to bounce directly backwards. However, if M > m, then there is a maximal angle of direction of M. Find this angle.
 
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Tonyt88 said:
A mass M collides with a stationary mass m. If M < m, then it is possible for M to bounce directly backwards. However, if M > m, then there is a maximal angle of direction of M. Find this angle.
What is conserved and what might be conserved?
 

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