A rod of length 50cm is pivoted at one end, It is raised such that if makes an angle of 30°^{ }from the horizontal as shown and released from rest. Its angular speed when it passes through the horizontal (in rad s^{−1 }) will be (g=10ms^{−2})
a. 

b. 

c. 

d. 

A rod of length 50cm is pivoted at one end, It is raised such that if makes an angle of 30°^{ }from the horizontal as shown and released from rest. Its angular speed when it passes through the horizontal (in rad s^{−1 }) will be (g=10ms^{−2})
a. 

b. 

c. 

d. 

Work done by gravity from initial to final position is,
W=mg
=
According to work energy theorem
W=
=
= rad/sec
∴ correct answer is (a)