You are at the controls of a particle accelerator,sending a beam of 3.90x107 m/s protons (mass m)at a gas target of an unknown element. Your detectortells you that some protons bounce straight back aftera collision with one of the nuclei of the unknownelement. All such protons rebound with a speed of3.60x107 m/s. Assume that the initial speed of thetarget nucleus is negligible and the collision is elastic.Part AFind the mass of one nucleus of the unknown element. Express your answer in terms of the proton mass m.Express your answer as a multiple of m.ΠΙ ΑΣΦmel =SubmitPart BUnucleus =Request AnswerSubmitwwwwwWhat is the speed of the unknown nucleus immediately after such a collision?Express your answer in meters per second.Π ΑΣΦRequest Answer?m?m/s

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