ch02-p063 - 63. We choose down as the +y direction and...

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63. We choose down as the + y direction and place the coordinate origin at the top of the building (which has height H ). During its fall, the ball passes (with velocity v 1 ) the top of the window (which is at y 1 ) at time t 1 , and passes the bottom (which is at y 2 ) at time t 2 . We are told y 2 y 1 = 1.20 m and t 2 t 1 = 0.125 s. Using Eq. 2-15 we have yy v tt g 211 2 1 2 1 2 1 2 −= −+ bg bg which immediately yields () 2 2 1 2 1 1.20 m 9.8 m/s 0.125 s 8.99 m/s. 0.125 s v == From this, Eq. 2-16 (with v 0 = 0) reveals the value of y 1 : 2 2 11 1 2 (8.99 m/s)
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This note was uploaded on 09/03/2009 for the course PHYS 1200 taught by Professor Stoler during the Spring '06 term at Rensselaer Polytechnic Institute.

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