以54km/h的速度行驶的汽车,以5m/s2加速度刹车,求刹车后5s内位移
人气：344 ℃ 时间：2019-08-21 07:35:07
解答
54km/h=15m/s
汽车从15m/s刹车到静止所用时间15/5=3秒
所以刹车后5s,汽车前3秒刹车到静止,然后静止2秒
刹车后5s内位移就是为刹车后3s的位移
s=vot-1/2at²=22.5m
推荐
猜你喜欢
- happiness is for everyone.求译!
- 写小数时,整数部分仍按( )的写法,整数部分是0的要写( ).
- 《人民解放军百万大军横渡长江》一文是按什么顺序报道三路军的渡江作战的?为什么这样安排顺序?
- 屏风,纳凉,帷幕,缓冲,造型,伧俗、雅俗之别造句
- To turn your dream into reality,you should first ______the hard life here which you has not got used to so far
- 足球循环赛中,红队胜黄队,比分为4:1,黄队胜蓝队,比分为1:0,蓝队胜红队,比分为1:0,算各队的净胜球数.
- 2.2*(-2.1)+1.21*4.2-2.1*0.22简算!
- it took him three hours to clean his bedroom的同义句
