A gun fires 20 bullets/sec each of mass 20gm, with a muzzle velocity of 50m/s. Find the force required to hold the gun in position.
A
20N
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B
50N
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C
8.67N
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D
42.22N
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Solution
The correct option is A20N Number of bullets fired per second =n=20
Total change in momentum per second due to bullets =Δp=nm(v−u)=20×20×10−3(50−0)=20kg m/s
Force required to hold the gun in position =Δpt=20kg m/s1s=20N