problem02_85 solution

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

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2.85: a) Let + y be upward. At ceiling, 2 0 s m 80 . 9 m, 0 . 3 , 0 - = = - = y y a y y v . Solve for v 0 y . . s m 7 . 7 gives ) ( 2 0 0 2 0 2 = - + = y y y y v y y a v v b) t a v v y y y + = 0 with the information from part (a) gives s 78 . 0 = t . c) Let the first ball travel downward a distance d in time t . It starts from its maximum height, so . 0 0 = y v 2 2 2 2 1 0 0 ) s m 9 . 4 ( gives t d t a t v y y y y = + = - The second ball has s m 5.1 s) m 7 . 7 ( 3 1 0 = = y v . In time t it must travel upward d - m 0 . 3 to be at the same place as the first ball.
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Unformatted text preview: . ) s m 9 . 4 ( ) s m 1 . 5 ( m . 3 gives 2 2 2 2 1 t t d t a t v y y y y-=-+ =-We have two equations in two unknowns, d and t . Solving gives s 59 . = t and m. 7 . 1 = d d) m 3 . 1 m . 3 =-d...
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