02_InstSolManual_PDF_Part19

02_InstSolManual_PDF_Part19 - s 2 2 2 1 2 9.8 m s 2 2 5 1...

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Solve: The graphs are sketched qualitatively in Figure 2.80. Figure 2.80 2.81. Set Up: Take to be upward. There are two periods of constant acceleration: while the engines fire and after they shut off. Constant acceleration equations can be applied within each period of constant acceleration. Solve: (a) Find the speed and height at the end of the first 20.0 s. and and Next consider the motion from this point to the maximum height. and gives so The duration of this part of the motion is obtained from t 5 v y 2 v 0 y a y 5 2 50 m / s 2 9.8 m / s 2 5 5.10 s v y 5 v 0 y 1 a y t : y 5 628 m. y 2 y 0 5 v y 2 2 v 0 y 2 2 a y 5 0 2 1 50.0 m /
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Unformatted text preview: / s 2 2 2 1 2 9.8 m / s 2 2 5 1 128 m, v y 2 5 v y 2 1 2 a y 1 y 2 y 2 a y 5 2 9.8 m / s 2 . v y 5 50.0 m / s, v y 5 0, y 5 500 m, y 5 y 1 v y t 1 1 2 a y t 2 5 1 2 1 2.50 m / s 2 21 20.0 s 2 2 5 500 m. v y 5 v y 1 a y t 5 1 2.50 m / s 2 21 20.0 s 2 5 50.0 m / s y 5 0. v y 5 0, a y 5 1 2.50 m / s 2 , a y 5 2 9.8 m / s 2 a y 5 1 2.50 m / s 2 1 y ( a ) v x v x v x ( b ) ( c ) ( d ) x O t v x O t x O t v x O t x O t v x O t x O t v x O t Motion along a Straight Line 2-19...
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