One with greater mass (8kg)
68 degrees would be the answer
I believe it is A. positive acceleration since it is speeding up
Answer:
4. both blocks will both have the same amount of kinetic energy.
Explanation:
When the blocks are released free from the compression force, the spring exerts equal and opposite force on each block but the block with heavier (double) mass will attain slower ( half ) speed as compared to the lighter block according to the law of inertia. This works in synchronization to energy conservation.
Spring force is given as:

where:
length of compression in the spring
<u>We know kinetic energy is given by:</u>

Hence the kinetic energy of both the blocks is equal when they are released to move free.