ch04-p028 - 28. We adopt the positive direction choices...

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28. We adopt the positive direction choices used in the textbook so that equations such as Eq. 4-22 are directly applicable. The coordinate origin is throwing point (the stone’s initial position). The x component of its initial velocity is given by vv x 00 0 = cos θ and the y component is given by y 000 = sin , where v 0 = 20 m/s is the initial speed and θ 0 = 40.0° is the launch angle. (a) At t = 1.10 s, its x coordinate is xv t == ° = 20 0 110 40 0 16 9 cos . . cos . . m/s s m b gb g (b) Its y coordinate at that instant is () ( ) 2 22 11 sin 20.0m/s 1.10s sin 40.0 9.80m/s 1.10s 8.21m. yv t g t =− = ° = (c) At t' = 1.80 s, its x coordinate is x = 20 0 180 40 0 27 6 .. c o s . . s
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