A ring of mass $m$ moves from point $1$ to point $2$ along a smooth rigid horizontal wire with a constant speed $v$. The average force acting the ring over the time of its motion from $1$ to $2$ is
A ring of mass $m$ moves from point $1$ to point $2$ along a smooth rigid horizontal wire with a constant speed $v$. The average force acting the ring over the time of its motion from $1$ to $2$ is
- A
$\frac{{2m{v^2}}}{R}\,\sin \,\theta $
- B
$\frac{{m{v^2}}}{R}$
- C
$\frac{{2m{v^2}\,\sin \,\frac{\theta }{2}}}{{R\theta }}$
- D
None of these
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