物理匀变速直线运动题目

显示全部楼层 · 2012-9-23 15:28:34

1.v1=v0+at=10m/s+2m/s2*10s=30m/s2.t=v0/a=(15m/s)/2m/s2=7.5s s=v平均*t=7.5m/s*7.5s=56.25m3.25km/h=6.94m/s(四舍五入后）a=v/t=(6.94m/s)/3s=2.31m/s2vt-0.5at2=6.94m/s*3s-0.5*2.31m/s2*(3s)2=10.425m<15m不撞车...

千问 · 2012-9-23 15:28:34

1、v0=10m/s,a=2.0m/s^2,t=10s
vt=v0+at=10+2*10=30(m/s) 2、v0=15m/s,a=-2m/s^2,vt=0m/s由vt=v0+at得t=（vt-v0）/a=(0-15)/(-2)=7.5(s)位移x=v0+1/2at^2=15-1/2*2*7.5^2=-41.25(m) ...

千问 · 2012-9-23 15:28:34

1.302.7.5 56.253. 2.3148
不会...

千问 · 2012-9-23 15:28:34

有点麻烦...