University Physics with Modern Physics with Mastering Physics (11th Edition)

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8.91: See Problem 8.90. Puck B moves at an angle 65.0 ) 65 25 90 i.e. ( ° = ° - ° ° from the original direction of puck A ’s motion, and from conservation of momentum in the - y direction, . 466 . 0 2 2 A B v v = Substituting this into the expression for conservation of momentum in the - x direction, s m 6 . 13 ) 65 cos 466 . 0 0 . 25 (cos 1 2 = + = ο ο A A v v , and so 34 . 6 2 = B v m/s. As an alternative, a coordinate system may be used with axes along the final directions
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Unformatted text preview: of motion (from Problem 8.90, these directions are known to be perpendicular). The initial direction of the puck’s motion is ° . 25 from the final direction, so , . 65 cos and . 25 cos 1 2 1 2 A B A A v v v v = ° = giving the same results....
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