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energy mechanical problems (physical) pls help! esy 10 points?

When a rifle with a longer barrel is fired, the force of expanding gases act on the bullet of a longer distance. What effect does this have on the speed of the bullet-ups? (U why time range has barrels long guns? A baseball and a golf ball has the same impulse, which has the most energy kinectic? Anyone want to sell you a Superball claims jump at a height greater than the height from which he fell. can this be?

Think about this … Power equals force times distance. While a bullet in the barrel force acting on it does it for the length of the barrel … Therefore, the longer the barrel longer than the distance so more energy transferred to the bullet. Now this is converted into kinetic energy. If the kinetic energy increases what happens to the speed of the bullet? You know that Ekin = 1 / 2 * m * v ^ 2 So v = sqrt [(2 * Ekin) / m] if the energy increases as does the speed, but only by a factor of the square root of energy. Not sure about the other.

Altus Athletic 55cm 600-Pound Body Ball with DVD (Metallic Blue) $13.99 The Altus(tm) 55cm body ball helps you shape and tone, develop strength and core, and improve posture and flexibility. The included inflate tape makes it easy to get the correct size. Comes with foot pump and instructional DVD….

Altus Athletic 75cm 600-Pound Body Ball with DVD (Light Blue) $12.99 The Altus(tm) 75cm body ball helps you shape and tone, develop strength and core, and improve posture and flexibility. The included inflate tape makes it easy to get the correct size. Comes with foot pump and instructional DVD….

Altus Athletic 65cm 600-Pound Body Ball with DVD (Pearl) $6.99 The Altus™ 65cm body ball helps you shape and tone, develop strength and core, and improve posture and flexibility. The included inflate tape makes it easy to get the correct size. Comes with foot pump and instructional DVD….

Pedco UltraClamp Assembly $21.53 The UltraClamp allows a camera to be solidly attached to a car window, bicycle handlebar, picnic table, or other similar object. Strong enough for any camera or camcorder, the UltraClamp attaches to round or flat objects up to 1.5 inches thick. The UltraClamp utilizes the same ball and socket mount found on UltraPods to allow the camera maximum flexibility in framing the subject. Weighs 6 oz. and …

NcStar AR15 Golf Ball Launcher (AGOLF) $24.99 ·        AGOLF will mount onto any Rifles with 1/2″-28 TPI Thread(muzzle thread pitch)·…

Wham-O Trac Ball Racket Game $9.78 A classic American backyard game, this trac ball set includes two jumbo-sized trac ball rackets for easy catching, along with two balls. This product is for ages 6 and up. About Wham-O Wham-O Inc. has been a facet of American popular culture for more than half a century. With its roots in Southern California, Wham-O has popularized some of the most iconic toy fads in history, including the Hula H…

Easton 5-Foot Pop-Up Multi-Sport Training Net $70.99 The Easton® 5-ft pop-up, multi-sport net is a multi-functional training aid that can be used as a catch net, a goal or a target. It comes with an adjustable, removable target and folds down to fit in a 29-in carrying case….

Wilson F1100 Official NFL Game Football $83.99 This Wilson® Official NFL® leather game ball is the same ball used in NFL® games. It offers you professional craftsmanship with a high-quality Wilson® leather construction for top performance at the highest level. Made in the USA. Ball features NFL Commissioner Roger Goodell’s signature….

Mario Power Tennis $39.99 Mario Power Tennis brings the heroes and villains of the Mushroom Kingdom together on the court! Use each player’s powerful shots and new power-ups to make for the craziest matches ever. Build up more and more skill points as you play to use stronger shots with all kinds of spin. Prove you’re the best and walk away with the Mushroom Kingdom championship!…

Jugs Instant Screen $127.87 The new Jugs Instant Screen travels with you wherever you go….