求高手解答这道选择题目~!~!a car is moving at a constant velocity when it is involved in a collision. The car comes to rest after 0.450s with an average acceleration of 65.0m/s^2 in the direction opposite that of the car's velocity. what was the speed, in km/h, of the c_百度作业帮
求高手解答这道选择题目~!~!a car is moving at a constant velocity when it is involved in a collision. The car comes to rest after 0.450s with an average acceleration of 65.0m/s^2 in the direction opposite that of the car's velocity. what was the speed, in km/h, of the car before the collision?不是很明白题目的意思,求个高手来解答啊啊啊啊啊~~~答案有5个其中一个~计算不到出来啊~有人会吗?a)29.2km/sb)44.8km/sc)80.5km/sd)105km/se)144km/s
意思是：汽车行动在恒定的速度时发生碰撞.汽车在0.450s停下来,做加速度与速度方向想反,为65.0m/s^2 的减速运动.问 汽车在碰撞之前速度多少km/h?该题可以等效成为 速度为0的匀加速运动.vt=v0+at=0+0.450*65.0=29.25m/s=105.3km/h复制可耻
怎么翻译的 狗屁不通
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What Is the HERS Index?
The Home Energy Rating System (HERS) Index is the
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What does a HERS rating say about a house?
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It can tell you so much about the home you live in, like how efficiently it’s operating
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When you're selling your home, a low HERS Index Score can command a higher resale price. And when you’re buying a home you can
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How does the HERS Index work?
A certified Home Energy Rater assesses the energy efficiency of a home, assigning it a relative performance score. The lower the number, the more energy efficient the home.
The U.S. Department of Energy has determined that a typical resale home scores 130 on the HERS Index while a standard new home is awarded a rating of 100.
A home with a HERS Index Score of 70 is 30% more energy efficient than a standard new home
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