In case of vertical circular motion of a particle by a thread of length r, if the tension in the thread is zer…

Question

In case of vertical circular motion of a particle by a thread of length $r$ , if the tension in the thread is zero at an angle $30^\circ$ above the horizontal radius through the centre, the velocity at the lowest point $A$ of the vertical circular path is ( $g$ = gravitational acceleration ).

A
$\sqrt{\dfrac{7}{2}gr}$
B
$\sqrt{4gr}$
C
$\sqrt{5gr}$
D
$\sqrt{\dfrac{5}{2}gr}$

Accepted Answer

A. $$\sqrt{\dfrac{7}{2}gr}$$

Answer

B. $$\sqrt{4gr}$$

Answer

C. $$\sqrt{5gr}$$

Answer

D. $$\sqrt{\dfrac{5}{2}gr}$$

Answer & step-by-step solution

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