02_InstSolManual_PDF_Part11

# 02_InstSolManual_PDF_Part11 - Motion along a Straight Line...

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(b) gives and Reflect: x is proportional to and t is proportional to 2.48. Set Up: Let be upward. at the maximum height. Solve: (a) gives (b) When the flea returns to ground, gives (c) downward, at all points in the motion. 2.49. Set Up: Let be downward. Solve: (a) The building is 30.6 m tall. (b) (c) The graphs of and y versus t are given in Figure 2.49. Take at the ground. Figure 2.49 2.50. Set Up: Take to be downward and and Solve: (a) and (b) (c) It is a poor assumption to neglect air resistance and aerodynamic lift. 2.51. Set Up: Take upward. at the maximum height. Solve: Consider the motion from the maximum height back to the initial level. For this motion and The ball went 33.5 m above its original position. (b) Consider the motion from just after it was hit to the maximum height. For this motion and gives (c) The graphs are sketched in Figure 2.51. Figure 2.51 y t O ( a )( b c ) t O a y t O v y v 0 y 2 v 0 y v 0 y 52 a y t 1 2 3.71 m / s 2 21 4.25 s 2 5 15.8 m / s. v y 5 v 0 y 1 a y t t 5 4.25 s. v y 5 0 y 5 y 0 1 v 0 y t 1 1 2 a y t 2 5 1 2 1 2 3.71 m / s 2 4.25 s 2 2 33.5 m t 5 4.25 s. v 0 y 5 0 a y 0.379 g 3.71 m / s 2 . v y 5 0 1 y v y 5 v 0 y 1 a y t 5 1 32 ft / s 2 30.2 s 2 5 966 ft / s 5 659 mph t 5 Å 2 y a y
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