10 planks are required to stop the bullet in initial velocity u thickness of each planks is x and all planks are producing equal retardation find the final velocity of bullet after coming out of first plank

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  1. I am not certain what you mean by "equal retardation". Is that equal force, or equally absorbing energy?

    Assuming equal force..

    so if each force is the same, acceleration is constant.


    now on ten planks
    where thickness is the thickness of one plank.
    so a=u^2/20t

    on the first plank
    vf^2=u^2+2u^2/20thick *thickness
    vf^2=u^2(1-1/10)=9/10 u^2

    vf=u sqrt(9/10)

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