B. Energy can change from one form to another
You can decrease the mass, or you can increase the force applied to the object
Answer:
reduce the velocity of collision
Yes, that’s true it has electrical energy
Explanation:
Given that,
Mass of the object, m = 7.11 kg
Spring constant of the spring, k = 61.6 N/m
Speed of the observer, 
We need to find the time period of oscillation observed by the observed. The time period of oscillation is given by :

Time period of oscillation measured by the observer is :

So, the time period of oscillation measured by the observer is 5.79 seconds.