A particle of mass \( 2 \mathrm{~kg} \) is moving under influence of a force which always act to...

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A particle of mass \( 2 \mathrm{~kg} \) is moving under influence of a force which always act towards the centre \&
\( \mathrm{P} \) whose potential energy is given by \( U(r)=2 r^{3} \) joule.

W) If the particle is moving in a circular orbit of radius \( \mathrm{r}=5 \mathrm{~m} \), find its energy.
(1) \( 500 \mathrm{~J} \)
(2) \( -150 \mathrm{~J} \)
(3) \( 250 \mathrm{~J} \)
(4) \( 625 \mathrm{~J} \)
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