Question

a child swings on a swing at the playground. the motion of the swing resembles the motion of a pendulum. when is kinetic energy of the swing decreasing? as it moves up from the bottom of the swing when it is moving the fastest at the bottom of the swing when it stops moving at the top of the swing

Explanation:

Kinetic energy \( KE=\frac{1}{2}mv^{2} \), so it depends on the speed \( v \). As the swing moves up from the bottom, its speed decreases (due to conversion of kinetic energy to potential energy). When moving fastest (at bottom), \( KE \) is maximum. At the top (stopped), \( KE = 0 \) (but it's not decreasing there, it's already at minimum).

Answer:

as it moves up from the bottom of the swing