The question says.. "The direction of motion of A is deflected through an angle θ by the collision."
What does this mean geometrically?
The whole question 
With theta being the angle being the intial velocity has been turned by is this correct?
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4$\begingroup$ It means that the initial velocity vector of A makes an angle $\theta $ with the final velocity vector of A $\endgroup$– EagleCommented Apr 27, 2019 at 13:40
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$\begingroup$ Obviously it must be assumed that A is not spinning for that equation to hold true. $\endgroup$– user207455Commented Apr 27, 2019 at 14:33
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$\begingroup$ Yes. v2 has the right meaning of $\theta$. $\endgroup$– PolaroidDreamsCommented Apr 27, 2019 at 15:04
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1$\begingroup$ Draw the two velocity vectors with their tails together. The angle between the shafts should be $\theta$. Your diagram is not correct. $\endgroup$– Bill NCommented Apr 27, 2019 at 15:28
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1 Answer
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Yes, the Deflected Angle $D$ between reflected ray $R$ after collision and incident ray $I$ vectors in as shown.
