A particle of mass 'm' moves along a circle of radius 'r' with constant tangential acceleration. If K.E. of the particle is 'E' by the end of third revolution after beginning of the motion, then magnitude of tangential acceleration is
1
\(\frac{\mathrm{E}}{2 \pi \mathrm{rm}}\)
2
\(\frac{\mathrm{E}}{6 \pi \mathrm{rm}}\)
3
\(\frac{\mathrm{E}}{8 \pi \mathrm{rm}}\)
4
\(\frac{\mathrm{E}}{4 \pi \mathrm{rm}}\)