21. Cars A and B are traveling In the same direction at the same speed of 70 kph on a level road. Car A is 150 m ahead of B. Car A decelerates at the rate of 2m/s2. From this Instant up to the time B overtakes A, how far has B traveled? B. 268 m D. 258 m C. 238 m A. 248 m 22. A projectile is fired with a muzzle velocity of 300 m/s from a gun almed upward at an angle of 20" with the horizontal, from the top of a building 30m high above a level ground. With what velocity will it hit the ground? B. C. D. 300.98 D. 169.74 310.98 A. 330.98 320.98 23. The base edge of a regular triangle pyramid is 12m. If the altitude is 9m., what is the volume in cu. m.? C. 180.13 187.06 193.99 B. A. 24. Two railroad tracks are perpendicular to each other. At 12:00 P.M. there is a train at each track approaching the crossing at 50 kph., one being 100 km, and the other 150 km away from the crossing How fast in kph is the distance between the two trains changing at 4:00 P.M.? A. 70.08 B. 69.08 C. 68.08 D. 67.08 25. The radius of the moon is 1080 miles. The gravitational acceleration at the moon's surface is 0.165 times the gravitational acceleration at the earth's surface. What is the velocity of escape from the moon in miles/sec.? C. 3.52 B. 1.47 D. 4.26 A. 2.38 26. Projectile is fired at an angle of 20 with the horizontal at the top of a 30-m high building. The muzzle velocity is 300m/s. What is the total time of flight? A. 32.6s B. 25.7s C. 21.2s D. 18.5s 27. A lighthouse is 2km off a straight shore. A search light at the lighthouse focuses to the car moving along the shore. When the car is 1 km from the point nearest to the lighthouse, the searchlight rotates 0.25 rev/hour. Find the speed of the car in kph. C. 2.92 B. 2.56 A. 3.93 28. The motion of body moving vertically upward is expressed as h = 100t-16.1t2, which h is the heigh in feet and t is the time in seconds. What is the velocity of the body when t = 2 seconds? A. 32.17fps B. 28.7fps C. 24.1fps D. 35.6fps D. 3.65 29. A pulley that is rotating at 36 rev/s is decelerated at 12 rad/sec until it stops. How many complete revolutions does it make within this period? A. 339 B. 335 C. 337 D. 333 30. Cars A and B are travelling in the same direction at the same speed of 70 kph, along a level road with car A 150m ahead D. 72.08 m of car B. Car decelerates at the rate of 2 m/s2. From this instant up to the time B overtakes A, how far has A traveled? C. 98.08 m B. 108.08 m A. 88.08 m 31. Engineer Cruz started walking from point O at uniform speed of 6 kph. After 2hours, Engineer Fernandez started walking from the same point O and walked 4 km in the first hour, 5 km in the second hour, and so on, increasing 1 km each hour. How many hours after Engr. Cruz left point 0 will they be together? A. 14 B. 12 C. 10 D. 8 32. A circular cylinder is circumscribed about a right prism having a square base one-meter on an edge. The volume of the cylinder is 6.283 m. Find its altitude in m. A. 69.08 B. 5 SITUATION: A truss structure is used to hold powerlines as illustrated. Calculate the reaction forces at the base of the tower C. 4.5 33. What is the horizontal reaction at A? A. 19 N() 300 N B. 19 N () C. 161 () D. 161 () 34. What is the vertical reaction at A? A. 19 N upward 10: B. 19 N downward C. 161 upward D. 161 downward 35. What is the roller reaction at B? A. 462 N upward B. 462 N downward C. 161 upward D. 161 downward 4 m D. 4 2m- 400 N B SITUATION: Two trains A and B are travelling in the same direction, with train A behind train B. Train A, 65 meters long, is travelling at 240 kph. Train B, 85 meters long, is travelling at 120 kph. At a certain instant the trains are 200 m apart (clear distance). 36. Find the time when train A starts to overtake train B. A. 8 sec B. 6 sec B. 15 sec 37. Find the time when train A completely overtakes train B. A. 5.1 sec C. 3 sec D. 12 sec C. 10.5 sec D. 1.5 sec C. 700 m D. 800 m 38. Find the distance travelled by train A when it completely overtakes train B. A. 500 m B. 600 m kamin vill be a wheth