Question
(a) Why does an ordinary rifle recoil (kick backward) when fired?(b) The barrel of a recoilless rifle is open at both ends. Describe how Newton’s third law applies when one is fired.(c) Can you safely stand close behind one when it is fired?
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Evidence boundary
This page answers OpenStax University Physics Volume 1, Chapter 5, Conceptual Question 13 (a–c). The momentum relations are idealized explanations, not measured firing data. The prompt gives no weapon design or safe distance. Rearward momentum may be carried by gas or other expelled material; no particular mechanism is assumed.