# exam2-F06-ans - Physics I Exam 2 Fall 2006 Answer Key Part...

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Answer Key Part A – 1: 23, 2: A, 3: D, 4: A 4 pts each. Subtract 2 points from #2 for each incorrect additional answer, minimum of 0 points. 5: A, 6: A, 7: C, 8: B, 9: C, 10: B, 11: A, 12: C 2 pts each. For #11, 1 point partial credit if it agrees with #6 but is wrong. (Don't miss please.) B-1 20 Points The key to this problem is the elastic collision. The easiest method to solve the problem is to use equations 45a to find V 2i and 45b or 44x to find V 2f . 0 . 1 v ) v )( 5 . 1 ( ) 4 )( 5 . 0 ( 5 . 3 v m m m 2 v m m m m v i , 2 i , 2 i , 2 2 1 2 i , 1 2 1 2 1 f , 1 - = + - = - + + + - = m/s 5 . 1 ) 0 . 1 )( 5 . 0 ( ) 4 )( 5 . 0 ( v m m m m v m m m 2 v i , 2 2 1 1 2 i , 1 2 1 1 f , 2 + = - + = + - + + = m/s Looking For using conservation of momentum or equation 45. using KE before = KE after or equation 45. constant V 2 before and after collision. straight line V 2 during collision. . correct value of V

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exam2-F06-ans - Physics I Exam 2 Fall 2006 Answer Key Part...

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