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JEE Main Physics question

PhysicsLaws of MotionJEE Main

A rifle of 20 kg mass can fire 4 bullets per second. The mass of each bullet is 35×10⁻³ kg and its final velocity is 400 ms⁻¹. Then the force that must be applied on the rifle so that it does not move backward while firing the bullets is

Answer: (D)

Solution

Force needed to accelerate the bullets forward = n·m·v = 4 × 0.035 × 400 = 56 N (directed forward). By Newton's third law, the rifle tends to recoil backward

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Question ID VK-152865