试题与答案

一只排球以水平速度10米/秒碰撞一静止的汽车后,以6米/秒的速度被弹回来,球碰汽

题型:填空题

题目:

一只排球以水平速度10米/秒碰撞一静止的汽车后,以6米/秒的速度被弹回来,球碰汽车后的速度大小是碰撞前速度的0.6倍.如果排球以10米/秒的水平速度碰撞沿同一方向以5米/秒的速度向前行驶的汽车,则碰后球的运动速度的大小是______米/秒,方向是______.

答案:

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答案:B考点:专题:课本知识同类信息.分析:化合物中钠、铝、钙、氢、氧通常显+1、+3、+2、+1、-2价.化合物名称中为铁时,铁显+3价,为亚铁时,铁显+2价.盐酸根中氯元素显-1价,硫酸根中硫元素显+6价.由物质...

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