The first is of a supermarket, caught at the moment the 9.0 magnitude earthquake unleashed its destructive force.
其一是一家超市的画面,是在9.0级地震释放出毁灭力量的那一刻拍摄的。
This is the force-- and the magnitude What is the acceleration of this system?
其大小,那么这个整体的加速度是多少?
It's always opposing the velocity, so this is the magnitude of the resistive force.
总是和速度相反,这是阻力的大小。
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