The two blocks A and $B$ have weights $W_A=72lb$ and $W_B=12lb$

$($Figure $1)$

Part A

If the kinetic coefficient of friction between the incline and block $A$ is ${}_k=0\mathrm{.}2,$ determine the speed of A after it moves $3$ ft down the plane starting from rest. Neglect the

mass of the cord and pulleys.

Express your answer to three significant figures and include the appropriate units.

View Available Hint$($s$)$

$v_A=$