To solve this problem we will apply the concepts related to the moment of inertia and Torque, the latter both its translational and rotational expression.
According to the information given the moment of inertia of the body would be

Replacing we have


Now the translational torque would be the product between the force applied (Its own Weight) and the distance (Its center of mass at the middle)




Now the rotational torque is defined as the product between the moment of inertia and the angular acceleration, then,

Replacing,


Therefore the angular acceleration is 
Explanation:
velocity gradient= velocity/distance
Answer:
I think option 1st is correct
lf it is wrong I apologise
HAVE A NICE DAY
Answer:
2.1406 ×
m/sec
Explanation:
we know that energy is always conserved
so from the law of energy conservation

here V is the potential difference
we know that mass of proton = 1.67×
kg
we have given speed =50000m/sec
so potential difference 
now mass of electron =9.11×
so for electron

so the velocity of electron will be 2.1406×
m/sec