MCQ
The unit of potential energy is
- A$gm\;(cm/{\sec ^2})$
- ✓$gm\;{(cm/\sec )^2}$
- C$gm\;(c{m^2}/\sec )$
- D$gm\;(cm/\sec )$
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$\rho=\left\{\begin{array}{l}\rho_0 \text { for } r \leq R \\ 0 \text { for } r>R\end{array}\right.$
where $\rho_0$ is a constant. A test mass can undergo circular motion under the influence of the gravitational field of particles. Its speed $V$ as a function of distance $\mathrm{r}(0<\mathrm{r}<\infty)$ from the centre of the system is represented by
