A vector quantity whose magnitude is a body's speed and whose direction is the body's direction of motion.
A vector quantity whose magnitude is a body's speed and whose direction is the body's direction of motion.
速度一种向量，其量值为物体的速率，其方向为物体运动的方向
A vector quantity whose magnitude is a body's speed and whose direction is the body's direction of motion.
速度一种向量，其量值为物体的速率，其方向为物体运动的方向