题目内容
Anything orderly and transparent, or anything that follows justice and rule of law can be described as positive energy.
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Mental training practices such as meditation might help promoting positive.
Mental health could not impact your eventual risk of dementia.
Corruption, unfairness, fraud, and indolence are negative energy.
一质量为60Kg的人静止地站在一个质量为600Kg,且正以2m/s的速率向河岸驶近的木船上，河水是静止的，其阻力不计。现人相对船以一水平速度v沿船的前进方向向河岸跳去，该人起跳后，船速减为原来的一半，说明v为( )
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