When the height of an object doubles, its potential energy also doubles. This is because potential energy is directly proportional to the height of the object. As the height increases, the object gains more potential energy due to its increased distance from the ground. Therefore, doubling the height results in a doubling of the potential energy of the object. **

When there are 2 cats, the number of paws doubles. Each cat has 4 paws, so when there are 2 cats, there are a total of 8 paws. Additionally, the amount of fur and dander in the household may also double with the presence of 2 cats. **

There is no women's doubles event in luge because the sport is traditionally competed in singles or individual events. Luge is a high-speed, technical sport that requires precise coordination and control, making it challenging for two athletes to compete together on the same sled. Additionally, the physical demands of luge may make it difficult for two athletes to navigate the course effectively as a team. As a result, luge has remained a solo event in both men's and women's competitions. **

Yes, there have been instances where actor stunt doubles have died during filming. For example, in 2017, a stunt double for the TV show "The Walking Dead" died after suffering injuries during a stunt. Additionally, in 2017, a stunt double for the movie "Deadpool 2" died while performing a motorcycle stunt. These tragic incidents highlight the risks and dangers that stunt performers face in their line of work. **

No, one cannot play tennis doubles alone. Tennis doubles requires two players on each team, so playing alone would not be possible. Doubles is a team sport that involves cooperation and coordination between two players, and it is not feasible for one person to cover the entire court and effectively compete against a pair of opponents. **

When rolling two dice, if both dice show the same number, it is called rolling doubles. In most games, rolling doubles gives the player a special advantage, such as being able to move their game piece twice the number shown on the dice. However, some games may have different rules for rolling doubles, so it's important to check the specific rules of the game being played. Overall, rolling doubles is usually a lucky outcome that can give the player an edge in the game. **

The braking distance quadruples when the speed doubles because the kinetic energy of a moving object is directly proportional to the square of its speed. When the speed doubles, the kinetic energy increases by a factor of four. This means that the vehicle has four times more energy that needs to be dissipated through braking, resulting in a much longer braking distance to come to a stop. Additionally, the force required to decelerate the vehicle is also directly proportional to its speed, further contributing to the increased braking distance. **

It can be argued that it is fair for famous actors to have doubles as it allows them to manage their busy schedules more effectively and ensure that filming can continue smoothly even if the actor is unavailable. Doubles can also be used for stunts or scenes that may be too risky for the actor to perform themselves. However, some may argue that it takes away from the authenticity of the actor's performance and can be misleading to audiences. Ultimately, the use of doubles is a common practice in the film industry and serves a practical purpose in ensuring the success of a production. **