At a given instant the $10-lb$ block $A$ in $($Figure $1).$ is moving downward with a speed of $3f\frac{t}{s}.$

Part A

Determine its speed $2$ s later if block $B$ has a weight of $4$ lb $,$ and the coefficient of kinetic friction between it and the inclined plane is ${}_k=0\mathrm{.}2.$ Neglect the

mass of the pulleys and cord.

Express your answer in feet per second to three significant figures.

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Figure $1$ of $1$

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