Question

When a person throws a meter stick, it is found that the centre of the stick is moving with speed $10m/s$ and left end of stick with speed $20m/s$. Both points move vertically upwards at that moment. Then angular speed of the stick is:

• A. $20rad/sec$
• B. $30rad/sec$
• C. None of these
• D. $10rad/sec$

Answer 1

The correct option is A $20rad/sec$

Step 1:Draw a labelled diagram.
Step 2:Find the angular speed of the stick.
Formula used: $\omega =\frac{v}{r}$
As we know,
${\omega }_{point}=\frac{v_{rel}}{r}$
$\omega =\frac{20-10}{0.5}=20rad/sec$

Final Answer: (a)