He was the main character of the scene.

He always lives without forgetting his child's naive mind.

I like watching children play in the park.

Kinetic energy is directly related to the speed of an object.

He left early to participate in the protest.

He has excellent kinesthesia, and he becomes good at any sport quickly.

He is a famous athlete.

I bought new sneakers.

He is bad at athletics, especially ball games.

In physics, momentum is defined as the product of the mass and velocity of an object.