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Blocks $\backslash ($ A $\backslash )$ and $\backslash ($ B $\backslash )$ each have $4\mathrm{.}5$ kg mass. All contact surfaces have the same coefficient of friction.

Determine the force $\backslash ($ P $\backslash )$ needed to cause impending motion of block $\backslash ($ B $\backslash )$ to the right if the coefficient of static friction is $0\mathrm{.}4.($Round the final answer to four decimal places.$)$

The force $\backslash ($ P $\backslash )$ needed to cause impending motion of block $\backslash ($ B $\backslash )$ to the right is