Question

When a pendulum is at the position all the way to the left when it is swinging (at the top of the arc), what is true of the kinetic and potential energy?

Answer 1

Potential energy + kinetic energy = constant at every moment in time

At the highest point:

potential energy is at its maximum 
kinetic energy is zero

Answer 2

Answer:

Kinetic energy(1/2mV²) = 0

Potential energy is converted to kinetic energy (mgh = 1/2mv²)

Explanation:

kinetic energy of an object or body has to do with the motion of the object/body at that point

Kinetic energy = 1/2MV²

The kinetic energy of the pendulum at the top of the arc is 0, this invariably means that there's no velocity of the pendulum at that point which makes it 0 (static). The Potential energy is converted to kinetic energy when the pendulum starts moving in the opposite direction after this period.