EN: Kinetic energy is the energy of motion. Anything that is moving has kinetic energy. - For a moving object, kinetic energy depends on mass and velocity. - In many Grade-10 problems: KE = 1/2 mv^2 (always ≥ 0).

中文：动能是由于运动而具有的能量，任何在运动的物体都有动能。 - 动能与质量和速度有关。 - 常用公式：KE = 1/2 mv^2（动能一定是非负的）。