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16. Determine the force necessary to accelerate a mass of 20 Ibm at a rate of 60 fi/sec' vertically upward, AL 37.3 Ibf B. 73.3 Ibf C. 57.3 Ibf D. 75.3 Ibf 17.A stone is projected from the ground with a velocity of 15 m/s at an angle of 30 with the horizontal ground. How high in m will it rise? Use g = 9.817 m/s. A 2BB5m B.2685m C.2.586 m D. 8652 m 18. Two particles moving in the same direction collide, stick together, and continue their mation together. Each particle has a mass of 10 g, and their respective velocities before the collision were 10 m/s and 100 m/s. The energy of the system after the collision is most nearly A 22 B.30J C.48J D.78J 19.An elevator weighing 2,000 Ib attains an upward velocity of 16 fps in 4 sec with uniform acceleration. What is the tension in the supporting cables? A 1,950 1b B.2150 Ib C.24851b D. 2,250 b 20.A rope is stretched between two rigid poles 30 feet apart. A load of 80 |bs was placed at the midpoint of the rope causing it to sag 7 feet. What is the approximate tension in the rope in Ibs? A, 10433 B. 59.45 C.94.59 D. 84.95