Problem $13\mathrm{.}10$

The $10-$lb block has a speed of $4f\frac{t}{s}$ when the force of $F=(8t^2)lb$ is applied. The coefficient of kinetic friction at the surface is ${}_k=0\mathrm{.}2.($Figure $1)$

Figure

$1$ of $1$

Part A

Determine the velocity of the block when it moves $s=21ft.$

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

$v=f\frac{t}{s}$

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