$4$

A pulley and two loads A and $B$ are connected by inextensible cords as shown. Load A has a constant acceleration $2\frac{m}{s}2$ and an initial velocity of $4\frac{m}{s}.$

Determine the number of revolutions executed by the pulley in $4$ seconds and the velocity of load $B$ after $4$ s $.$

Answer: $3\mathrm{.}39$rev,$7\mathrm{.}2\frac{m}{s}$

$1$