$13-18.$ A $40-lb$ suitcase slides from rest $20$ ft down the

smooth ramp.

it strikes the

ground at $C.$ How rong uves mianc io go nevil $A$ to $C?$

$13-19.$ Solve Prob, $13-18$ if the suitcase has an initial

velocity down the ramp of $v_A=10f\frac{t}{s}$ and the coefficient

of kinetic friction along $AB$ is ${}_k=0\mathrm{.}2.$ Solve $13-19$ please