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Sir please explain this Q again bcz I was unable to understand it.What is line of impact here,and from where vcostheta come,why e=tan 2 theta,pls pls pls clear this Q to me.

Sir please explain this Q again bcz I was unable to understand it.What is line of impact here,and from where vcostheta come,why e=tan2theta,pls pls pls clear this Q to me.

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Grade:12th pass

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