Complete Question
The complete question is shown on the first and second uploaded image
Answer:
The minimum mass of
correct option is E
Explanation:
Free body diagram of the set up in the question is shown on the third uploaded image
The mass of board is 
The length of the board is 
The length extending over the edge is 
The second mass is 
Now to obtain
we take moment about the edge of the platform

Substituting value


Sounds that have the same pitch and loudness can be differentiated by intensity and tone.
Answer:
I think c is the answer.....