$[1/2$ Points$]$

A $m_1=5\mathrm{.}14-kg$ block is placed on top of a $m_2=10\mathrm{.}0-kg$ block $($figure$).$ A horizontal force of $F=45\mathrm{.}0N$ is applied to the $10\mathrm{.}0-kg$ block, and the $5\mathrm{.}14-kg$ block is tied to the wall. The coefficient of kinetic friction between all moving surfaces is $0\mathrm{.}186.$

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$($a$)$ Determine the magnitude of the tension in the string.

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$($b$)$ Determine the magnitude of the acceleration of the $10\mathrm{.}0-kg$ block.

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Your response differs from the correct answer by more than $100\%,\frac{m}{s^2}$