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Mass of the gun (m) = 20 kg
Mass of each bullet (M) = 35g= 0.036 kg
Velocity Of Bullet(v)=400m/s
Number of bullets/sec= 400/60= 20/3
Force = Bullet mass × velocity × bullet/sec
=0.035 × 400 × 20/3
= 93.3333 newtons (approximately)
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