Exercise $7\mathrm{.}9$

Two trailers, A of mass $2$ Mg and B of mass $1\mathrm{.}5$ Mg are moving with velocities shown. The two trailers collide at the junction and stuck and move together. Determine velocity of both trailers just after the collision. If friction between the trailers and the road is $10$ kN $,$ determine the distance before the trailers stop moving.

$($Answer: $,v_2=6\mathrm{.}76\frac{m}{s},8m)$