Question

A pendulum is raised 1.5 cm and allowed to fall. if air resistance is negligible, how high will the pendulum rise on the other side?

Answer 1

It should go to the same height if its not interacting with air

Answer 2

It will rise to same height (1.5 cm) on the other side of the pendulum.

Step-by-step explanation:

When the pendulum moves, its kinetic energy is maximum at its mean position and potential energy is zero. While at both ends potential energy is maximum and the kinetic energy is minimum that is zero.

The energy is conserved during the process. So, if the friction is neglected, then there must be no loss of energy and the pendulum must rise to the same height on the other hand, as well. That is 1.5 cm.