The block's velocity is determined as 10.03 m/s.
<u>Explanation:</u>
According to work energy theorem, the work done on an object is equal to the change in kinetic energy of the object.
So, work done = Kinetic energy

Thus, the velocity can be determined as


Velocity = 10.03 m/s.
So the block's velocity is determined as 10.03 m/s.
The answer is D. The input force is equal to the output force.
I just did test and got it right
Answer:
the extension would be less the new extension might be 3 cm
Explanation: