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 xcomponent of its initial velocity is given by vvx000=cosθand the ycomponent is given by y000=sin, where v0= 20 m/s is the initial speed and θ 0= 40.0° is the launch angle. (a) At t= 1.10 s, its xcoordinate is xvt==°=20 011040 016 9cos..cos..m/ssmbgbg(b) Its ycoordinate at that instant is ()()22211sin20.0m/s 1.10s sin 40.09.80m/s1.10s8.21m.yvtgt=−=°−=(c) At t'= 1.80 s, its xcoordinate isx=°=20 018040 027 6..cos..s
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