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How to take the component of final momentum when a ball strikes surface at an angle 60 and reflects at same speed and same angle with surface?
After collision take horizontal and vertical components as vcos60 and vsin60 in x- and -y direction respectively.And do the same for initial velocity.And apply momentum conservation in x and y direction separetly.
In many books there is written vcos60(-i) and vcos60(-j) for x-plane and y- plane respectively............
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