1.We characterize inertia in motion by momentum.Can you tell

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1.We characterize inertia in motion by momentum.Can you tell what quantity is characterizeing the inertia of an object at rest?
2.The impulse-momentum equation is Ft=△mv,give an example of applying the equation,with numerical values for each term,symbol that you see in the equation

第一题是物体静止状态动量为零.
第二题为给出动量定理的具体例子,来说明该等式.
比如,一质量为3KG的物体从高 39.2m落下
落下1秒时的动量多大.
Ft=△mv=3kg*9.8m/s=29.4(kg·m/s)
很久没学了,基本上全忘记了.

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