Question

6-9

6) A train starts from rest and accelerates uniformly, until it has traveled 5.4 km and acquired a 6) velocity of 31 m/s. The train then moves at a constant velocity of 31 m/s for 400 s. The train thern decelerates uniformly at 0.065 m/s2, until it is brought to a halt. The distance traveled by the train during deceleration, in km, is closest to: A) 6.0 B) 7.0 C) 6.7 D) 63 E) 7.4 Situation 2.2 A rock is projected upward from the surface of the moon, at time t-00s, with a velocity of 30 m/s. The acceleration due to gravity at the surface of the moon is 1.62 m/s2. 7) In Situation 2.2, the time when the rock is ascending at a height of 180 m is closest to: 7) A)8s B) 17s C) 30s D) 12s E) 23 s 8) In Situation 2.2, the height of the rock when it is descending with a velocity of 20 m/s is closest tor: 8) A) 145 m B) 155 m C) 115 m D) 125 m E) 135 m Figure 3.2 30° 20m 0 9) A projectile is fired from the origin (at y 0 m) as shown in the figure. The initial velocity 9) components are ox 980 m/s and Doy-60 m/s. The projectile reaches maximum height at point P. then it falls and strikes the ground at point Q. In Fig. 3.2, the y-coordinate of point P is closest to: E) 49,180 m A) 180 m B) 370 m C) 49,000 m D) 98,000 m

Answer 1

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