Explanation:
Recoil is due to action-reaction pair: gun exerts forward force on bullet, bullet exerts backward force on gun. Newton's third law states for every action there is equal and opposite reaction. Conservation of momentum also explains recoil, but the immediate law is third law. Gun recoil velocity is calculated using conservation of momentum derived from third law.
Explanation:
Assertion true: a = -ω²x, max at max |x|. Reason true: F = -kx (Hooke's law), and F = ma ⇒ a ∝ -x. Reason correctly explains why acceleration peaks at extremes. Memory tip: 'SHM: F ∝ -x ⇒ a ∝ -x'. Assertion-reason testing SHM fundamentals, frequently examined in competitive exams.
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