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ICSE Class 10 Answered

A compressed spring has a tennis ball of mass 0.5 kg attached to it. The spring is then released which sends the ball moving on a horizontal surface, with a sped of 2m/s-1. What is the elastic energy of the compressed spring?
Asked by khushdab | 23 Apr, 2020, 02:20: PM
answered-by-expert Expert Answer
When the spring is released all the potential energy stored in the compressed spring gets converted to kinetic energy. 
By using principle of consvervation of energy, 
Total energy = Potential energy + Kinetic energy 
Thus, 
P.E. = K.E. 
 
K. E. space equals space 1 half m v squared space
equals space 1 half cross times 0.5 space cross times open parentheses 2 close parentheses squared space
equals space 1 space J space

T h u s comma space
P. E. space equals space 1 space J 
Thus, the elastic potential energy when spring was compressed is 1 Joule. 
Answered by Shiwani Sawant | 23 Apr, 2020, 07:23: PM
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