The bouncy ball was invented by a chemist named Norman Stingley in 1965. Stingley created the bouncy ball by combining rubber and a polymer compound, which resulted in a highly elastic material that could bounce to great heights. His invention quickly became popular as a toy for children and remains a classic plaything to this day. **

No, viscose is not elastic. Viscose is a type of rayon fabric made from natural fibers such as wood pulp. It is known for its soft and smooth texture, but it does not have the stretch or elasticity that is characteristic of elastic materials like spandex or elastane. Viscose can drape well and has good moisture-wicking properties, but it does not have the ability to stretch and bounce back like elastic fabrics do. **

Yes, bouncy balls can break upon impact, especially if they are made of low-quality materials or have been used for a long time. When a bouncy ball is thrown or dropped with a significant amount of force, it can hit a hard surface and break into pieces. Additionally, extreme temperatures can also cause bouncy balls to become more brittle and prone to breaking upon impact. **

The speed at which a bouncy ball flies can vary depending on a few factors such as the force with which it is thrown, the surface it bounces off, and the material and design of the ball itself. Generally, a bouncy ball can reach speeds of around 20-30 miles per hour when thrown with a strong force. However, this speed can increase or decrease based on the specific conditions and circumstances. **

Yes, it is possible to set up a bouncy castle in a sports hall as long as there is enough space and the hall's regulations allow for it. The sports hall should have a high enough ceiling to accommodate the bouncy castle and enough open space for it to be safely set up. Additionally, the surface of the sports hall should be suitable for anchoring the bouncy castle and ensuring the safety of the participants. It is important to check with the sports hall management and follow any guidelines or restrictions they may have in place. **

Yes, it is possible to finish an inelastic cotton fabric with an elastic jersey bias binding. The elastic jersey bias binding will provide stretch and flexibility to the edges of the fabric, allowing for a comfortable and secure fit. This combination can be a great way to add a pop of color or texture to a garment while also ensuring a comfortable and flexible finish. Just make sure to sew the binding carefully to ensure a clean and professional look. **

Yes, it is possible to finish an inelastic cotton fabric with an elastic jersey bias tape. The elastic jersey bias tape will provide stretch and flexibility to the edges of the fabric, allowing for a comfortable and secure finish. However, it is important to consider the weight and thickness of the fabric and bias tape to ensure that they work well together and do not create bulkiness or distortion in the finished garment. Testing the combination on a small sample piece before applying it to the entire project is recommended to ensure the desired result. **

The maximum flight height of the first bouncy ball when it lands on a larger bouncy ball is equal to the sum of the radius of the larger ball and the initial height from which the first ball was dropped. This is because the first ball will bounce back up to a height equal to the radius of the larger ball before falling back down. Therefore, the maximum flight height is determined by the size of the larger ball and the initial height of the first ball. **