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A bouncy ball or rubber ball is a spherical toy ball , usually fairly small, made of elastic material which allows it to bounce against hard surfaces.

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When thrown against a hard surface, bouncy balls retain their momentum and much of their kinetic energy or, if dropped, convert much of their potential energy to kinetic energy. They can thus rebound with an appreciable fraction of their original force. Solid rubber balls such as the Spaldeen a corruption of Spalding , the manufacturer , about the size of a tennis ball and often colored pink, have been manufactured since the s and remain so into the 21st century.


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They were fundamental to the development of American street games such as stickball , in addition to other uses in play. Other manufacturers have made similar balls, such as the Pensie Pinkie. A superball or power ball is a bouncy ball of composed of a type of synthetic rubber originally a hard elastomer Polybutadiene alloy named Zectron invented in , which has a higher coefficient of restitution 0.

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They were first sold by the Wham-O toy company under the name Super Ball, which remains their trademark. Skyball is a brand of hollow medium-sized bouncy ball filled with a mix of helium and compressed air, claimed by the manufacturer to have particularly good bounce characteristics.

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Nerf balls, introduced in , are also small balls that bounce, but they have a lower coefficient of restitution than a typical bouncy ball. Balls similar in size and composition to Spaldeens, but featuring a plethora of designs such as a baseball pattern, miniature basketball and soccer ball patterns, and so forth are offered by many companies.

Due to their low cost per unit, bouncy balls with logos or other designs are sometimes used as promotional merchandise. Bouncy balls may, by means of fluorescence , chemiluminescence , or motion-activated LEDs , emit light; such balls are called glow balls.

Balls composed of many rubber bands , or bouncy balls made of borax , glue, and cornstarch, are sometimes homemade. First line contains an integer denoting the number of test cases.

Bouncy ball

Each of the following lines contain two integers and. For each of test cases print one line containing a single integer - the answer to a problem. We use cookies to ensure you have the best browsing experience on our website. Please read our cookie policy for more information about how we use cookies.

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