$2\mathrm{.}10$ The boy is standing at the centre of a large disk, which is rotating with a constant angular velocity,

$\backslash$omega $.$ The boy starts walking with a constant speed v along a radial line painted on the disc. What is the boy's velocity, v$,$ and acceleration, a$,$ in terms of $\backslash$omega $,$v and time t$.$ Sketch the boy's velocity after $10$ s $,$ if $\backslash$omega $=0\mathrm{.}2$rad$/$s $,$v$=1\mathrm{.}5($m$)/($s$).$