.... I don’t know but, he will be able to make smarter choices, he will be able to think before he does something, honestly don’t know
The acceleration should 5.4 m/s^2
C and d have the same amount of protons and electrons
Answer:

Explanation:
As we know that there is no external torque on the system of two disc
then the angular momentum of the system will remains conserved
So we will have

now we have

also we have

now from above equation we have

now we have

