$(4)$

rod:

length $=L=1\mathrm{.}4m$

also:

$V_{{?}_{?}}(B)=2\mathrm{.}5\frac{m}{s}$longleftarrow

$a_{{?}_{?}}(B)=3\mathrm{.}5\frac{m}{s^2}$longleftarrow

A rod is positioned on two surfaces as shown, and end $B$ has the velocity and acceleration indicated. Find

$($a$)V_{{?}_{?}}(A),a_{{?}_{?}}(A)($mag and direc$)$

$($b$)w,$prop $($mag and sense$)$