7. How much energy is stored in a rubberband that is stretched 0.5 meters if the spring coefficient of the rubberband is 2.2 N/m?*
Answer?

0.275J

Explanation:

Given parameters:

Extension  = 0.5m

Spring coefficient  = 2.2N/m

Unknown:

Energy stored in the rubberband  = ?

Solution:

The elastic potential energy is given as:

  Elastic potential energy  = k e²  

 k is the spring constant

e is the extension

         Elastic potential energy  =  x 2.2 x 0.5²  = 0.275J

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the bal will not change its velocity.