1. if a rocket is fired vertically upward from the earth's surface with initial velocity 192 ft / sec, when the rocket reaches its maximum height from the ground and what the maximum height? how long does it take to reach the ground again and how much speed when hitting the ground?
2. a weight W attached to a rope 50 feet long and through the point P, 20 feet above the ground. The other end of the rope attached to a truck at point A, 2 feet above ground level, if the truck was moving away at a speed of 9 ft / sec, how fast it loads up when he was 6 feet from the ground?
Kamis, 03 Desember 2009
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