The barrel of rifle A is 2.00 cm longer than the barrel of rifle B. Which rifle

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The barrel of rifle A is 2.00 cm longer than the barrel of rifle B. Which rifle will have the higher muzzle speed?
(a) If the speed of a particle is doubled, what happens to its kinetic energy?
(b) What can be said about the speed of a particle if the net work done on it is zero?
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