(b)gives and Reflect:xis proportional to and tis 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 yversus tare given in Figure 2.49. Take at the ground.Figure 2.492.50. 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 andThe 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 2.51ytO(a)(bc)tOaytOvyv0y2v0yv0y52ayt123.71 m/s2214.25 s2515.8 m/s.vy5v0y1aytt54.25 s.vy50y5y01v0yt112ayt2512123.71 m/s24.25 s2233.5 mt54.25 s.v0y50ay0.379g3.71 m/s2.vy501yvy5v0y1ayt5132 ft/s230.2 s25966 ft/s5659 mpht5Å2yay
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