Can AP Shell Pierce 2 Steel Plates? | Work Questions

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The discussion revolves around whether an armor-piercing shell (AP) can penetrate two steel plates given its initial speed of 1800 m/s and a reduced speed of 1200 m/s after the first plate. The main concern is the reduction in speed after each penetration and how to calculate the kinetic energy (Ek) using the formula Ek = 1/2 mv² to determine if it can pierce the second plate. Participants emphasize the importance of showing calculations and working through the problem independently, as per forum rules. The conversation highlights the need for understanding the physics of motion and energy in this context. Overall, the inquiry seeks clarity on the mechanics of armor penetration.
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With the initial speed of 1800ms-1, AP(Armor Piercing Shell) after piercing through the 1st steel plate its speed is 1200ms-1. Can it pierces through the second steel plate? I know what you mean but the problem I encounter is I am not sure whether the speed will reduce by 600ms-1 every piercing? And I don't know how can i show that it can or it can't pierces through the 2nd steel plate? On my understanding this is a horizontal motion so there wouldn't be any Ep. There will only be Ek and with the formula Ek=1/2mv2 how i can show will it pierces through the 2nd plate.
Your help will be much appreciate!
Thank you!
 
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Please show your work... we on PF can't just help without you working out on your own as per the rules.
 
Thread 'Correct statement about size of wire to produce larger extension'

Thread 'Correct statement about size of wire to produce larger extension'

The answer is (B) but I don't really understand why. Based on formula of Young Modulus: $$x=\frac{FL}{AE}$$ The second wire made of the same material so it means they have same Young Modulus. Larger extension means larger value of ##x## so to get larger value of ##x## we can increase ##F## and ##L## and decrease ##A## I am not sure whether there is change in ##F## for first and second wire so I will just assume ##F## does not change. It leaves (B) and (C) as possible options so why is (C)...
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