Can AP Shell Pierce 2 Steel Plates? | Work Questions

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Die4Physics
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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.