A 6.40 kg pendulum begins to swing from rest at a height of 1.05 m. After it swings through the lowest point and up the other side, it only reaches a maximum height of 0.985 m. How much of its total energy did the pendulum lose during the swing from
One side to the other?

The pendulum lost 4.08 ) of energy.
The pendulum lost 65.9) of energy.
The pendulum lost 61.8 J of energy.
The pendulum lost no energy.