JEE Main Physics question
A machine gun fires 240 bullets per minute. If the mass of each bullet is 10 g and the velocity of the bullets is 600 ms⁻¹, the power (in kW) of the gun is
Answer: (D)
Solution
n = 240/60 = 4 bullets/s. Power = n × ½mv² = 4 × ½(0.01)(600²) = 4 × 1800 = 7200 W = 7.2 kW.