Plz find the initial value (u)
Thank you soo much!!!

u =11

Explanation:

brackets were inserted in the 1st step,to make it simpler as multiplication is done first, before addition.

hope this helps:))

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.