Work Power and Energy 5 Question 8
10. A particle is suspended vertically from a point $O$ by an inextensible massless string of length $L$. A vertical line $A B$ is at a distance $L / 8$ from $O$ as shown in figure. The object is given a horizontal velocity $u$. At some point, its motion ceases to be circular and eventually the object passes through the line $A B$. At the instant of crossing $A B$, its velocity is horizontal. Find
$u$.
(1999, 10M)
Show Answer
Answer:
Correct Answer: 10. (b)
Solution:
- $l _1=2 l _2 \Rightarrow l _1=\frac{2}{3} l$
Force constant $k \propto \frac{1}{\text { length of spring }}$
