I guess it’s d) isobaric mate correct me if I am wrong :D
Answer:
The forces that do non-zero work on the block are gravity and normal reaction force
Explanation:
Energy that transfers through the medium
Answer:
Yes
Explanation:
The displacement covered by a body in unit time is called velocity.
Answer:
Explanation:
Given
initially mass is stretched to 
Let k be the spring Constant of spring
Therefore Total Mechanical Energy is 
Position at which kinetic Energy is equal to Elastic Potential Energy


it is given

thus 


