Subject: General Physics

20 Kilauea in Hawaii is the world's most continuously active volcano. Very active volcanoes characteristically eject red-hot rocks and lava rather than smoke and ash. Suppose a large rock is ejected from the volcano with a speed of 25.0 m/s and at an angle above the horizontal, as shown in Figure 3.39. The rock strikes the side of the volcano at an altitude 20.0 m lower than its starting point. (3) Calculate the time it takes the rock to follow this path. (b) What are the magnitude and direction of the rock's velocity at impact? (Non-anonymous question@}(10 Points) Pedro throws a ball vertically upward at 10 m/s from the roof of a 30-meter building. On its way down he fails to catch it. The ball continues to move until it reaches the ground. Ignore the effect of air resistance. Calculate: a. the maximum height above the ground that the ball will reach. b. the time taken from the moment it was thrown until it reached the ground. 0. the speed of the ball when it is 10 meters below the roof of the building. (Non-anonymous question)(10 Points)