JEE Main Physics question
A machine gun mounted on a 2000 kg car on a horizontal frictionless surface fires 10 bullets per second. If 10 g is the mass of each bullet and 500 ms⁻¹ is the velocity of each bullet, then the acceleration of the car will be
Answer: (A)
Solution
The recoil force on the car = rate of momentum given to the bullets = n·m·v = 10×0.01×500 = 50 N. a = F/ = 50/2000 = 0.025 ms⁻².