A $2\mathrm{.}0-$kg block slides across a rough surface with a constant coefficient of kinetic friction of $0\mathrm{.}50$ as shown in $($Figure $1).$ The block starts at $x=0$ with an initial velocity of $4\mathrm{.}9\frac{m}{s}.$ Pushing the block is a force directed at $36\mathrm{.}8$ below the horizontal and whose magnitude increases with position as shown in $($Figure $2).$

What is the initial kinetic energy of the block?

Express your answer with the appropriate units.

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Part B

How much work is done by the applied force in the first $1\mathrm{.}9$ m $?$

Express your answer with the appropriate units.

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Part C

Figure

$1$ of $2$

$$ What is the magnitude of the friction force at $0\mathrm{.}0$ m $?$

Express your answer with the appropriate units.

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