**Question 8: What type of energy is stored in the spring of a watch?**
ANSWER
When we wind the spring of a watch, we do work on it. This work appears as elastic potential energy of the spring.
Mathematically, this work is equal to

.
Where ‘k’ is the spring constant.
Therefore,
Elastic potential energy in the spring =

This potential energy then slowly converts to K-E and we see the needles of the watch moving round the clock.

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