Question

A child swinging on a swing set reaches the lowest point in her swing.Then:

• A. The tension in the rope is equal to her weight
• B. The tension in the rope supplies a centrifugal force
• C. Her kinetic energy is at maximum
• D. Her tangential acceleration equals gravity
• E. Her angular velocity is minimum

Answer 1

The correct option is C Her kinetic energy is at maximum

According to conservation of total energy, $E=U+K=constant$

At the lowest point, the potential energy of the child is minimum, thus her kinetic energy must be maximum at that point.