We have to speed up the watch so we need to decrease time period of pendulum. So we hv to reduce the length.
So, acceleration is the change of velocity in time. If no vectors are used, one can use speed:
a = (final speed - start peed)/ time = 10/5= 1 m/s^2,
Notice that the units are m/s^2, or (m/s)/s. That is speed (m/s) per unit time (s)
Explanation:
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Energy cannot be created or destroyed
I hope that helps