Why does a gun recoil on firing ? Obtain an expression for its average speed.
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M1 x V1 = M2 x V2where M1 = mass of ejecta ; namely mass of the bullet PLUS half the weight of the powder chargeV1 = velocity in feet per second of ejectaM2 = mass of the gunV2 = recoil velocity in feet per second of gunNote: bullet weight and powder charge weight are customarily given in GRAINS; 7000 grains to the poundNormal
weight in common use in Standard English units is “pounds weight” .
This must be converted to “pounds-mass” by dividing by the acceleration
due to gravity “g”, numerically 32.17 feet per second squared. “"Pounds
-mass” - is also called a “slug”. Hey , I didn't make it up.
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