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# Newton's second law: Magnitude of average net force that acts on flight recorder box

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Airplane flight recorders must be able to survive catastrophic crashes. Therefore, they are typically encased in crash-resistant steel or titanium boxes that are subjected to rigorous testing. One of the test is an impact shock test, in which the box must survive being thrown at high speeds against a barrier. A 41-kg box is thrown at a speed of 220 m/s and is brought to a halt in a collision that lasts for a time of 6.5 ms. What is the magnitude of the average net force that acts on the box during the collision?

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With explanations and calculations, the problem is solved.

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Force (F) = change in momentum/time
change in momentum = dp = m*v_final - m*v_initial
v_initial ...

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• BEng, Allahabad University, India
• MSc , Pune University, India
• PhD (IP), Pune University, India
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