Part A A proton has an initial speed of 4.0×105 m/s. What potential difference is required to bring the proton to rest? Express your answer using two significant figures. AV 840 V Submit Previous Answers Part B Correct Correct answer is shown. Your answer 836 V was either rounded differently or used a different number of significant figures than required for this part. What potential difference is required to reduce the initial speed of the proton by a factor of 2? Express your answer using two significant figures. ΕΠΙ ΑΣΦ AV = Submit Request Answer Part C ? V What potential difference is required to reduce the initial kinetic energy of the proton by a factor of 2? Express your answer using two significant figures. ΜΕ ΑΣΦ AV = Submit Request Answer ? V

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