creating to the ground? Ans. _21 m/s__ (2D kinematics, 40%) As shown in Fig. 2, an object is launched from the ground with a speed of 20 m/s in an angle of 60 degree from horizontal and lands on a building top. Use 10 m/s for this problem. (a) What is horizontal initial-launching speed? Ans._ _10 m/s_ (b) What is the vertical initial-launching speed? Ans. 17.3 m/s (c) How long does the object take to reach to the maximum height? Ans._ _1.73 (d) What is the maximum height the object can reach above the ground? Ans. 15 m le) How long does it take for the object to reach the building top after reaching the maximum height? Ans. 1. (f) What is the horizontal speed of the object just before it reaches the building top? Ans. ___10 m/s_ (6) How far does the object fly horizontally? Ans.__31 m__ (h) What is the final speed of the object just before reaching the building top? Ans. __17.2 m/s_ Solt CAIHTOA G1 G2 A.VO Lab Table Vis Vo=20 m/s 60° Range FiR. I – Fig. 2 11, 20. los 60=20.= 10 mis – from ground to top