Pearl+River+Tower,+C+Carollo

= **Pearl River Tower** =

The Pearl River Tower is located in Guangzhou, China. Construction was started in 2006 and the building was completed in 2011. The building is 1,051.91 ft tall and 2.3 million square feet. It features 71 floors. The tower was designed to be the world's most energy efficient, super-tall tower ever built. The building's orientation was dictated by the direction of the prevailing wind. The Pearl River Tower has two major mechanical floors where turbines generate electricity from the wind blowing through the floors. It is mainly used by the China National Tobacco Corporation.



__Problems__: 1. The Pearl River Tower is hosting a basketball game on the roof of the building. One of the basketballs is dropped off of the court that is on the roof and falls to the ground. How long will it take to reach the ground if the roof is 1, 051.91 feet tall?

2. Someone from the game sees the ball fall off of the court and goes to get it. If they throw the ball from the ground up to the roof at a velocity of 20 ft/s then how long will it take for the ball to get back to the game?