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Q. Suppose the coefficient of kinetic friction between m_{rm A} and the plane in the figure is mu_k = 0.15, and that m_{rm{A}} = m_{rm{B}} = 2.7{rm{ kg}}. What smallest value of mu _{rm{k}} will keep the system from accelerating?

Q. An electron, initially at rest is accelerated through a potential difference of 450 V. What is the speed of the electron due to this potential difference?

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