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explain why the projectile fired from a long- barrelled gun is subject to less acceleration than a projectile fired from a short- barrelled gun if the range is the same in both cases?
answer before mornin if convenient . If inconvenient answer anyway . *yawn*
 
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the bullet in long barreled gun is given a rotational spin to make it more accurate. Hence some of the force is used up in i and less left for acceleration.

That is all I can say :p
my sir explained it to me in this way that the time taken for the long barrelled gun would be more than the short barraled one so since a=v-u/t so acceleration will decrease.
 
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