题目内容
(1)一辆汽车从车站出发作匀加速运动,经10 s速度达到108 km/h .
(2)高速列车过桥后沿平直铁路匀加速行驶,经3 min速度从54 km/h提高到180 km/h .
(3)沿光滑水平地面以10 m/s 运动的小球,撞墙后以原速大小反弹,与墙壁接触时间为0.2 s .
(1)3 m/s2(2)0.19 m/s2(3)-100 m/s2
由Vt = V0 + at 得a = (Vt-V0) / t
(1) 108 km/h="30" m/s a1 = (Vt-V0) / t = (30-0)/10 = 3 m/s2
(2) 54 km/h =" 15" m/s 180 km/h =" 50" m/s
a2 = (Vt-V0) / t = (50-15)/3×60 =" 0.19" m/s2
(3) a3 = (Vt-V0) / t = (-10-10)/0.2 = -100 m/s2
(1) 108 km/h="30" m/s a1 = (Vt-V0) / t = (30-0)/10 = 3 m/s2
(2) 54 km/h =" 15" m/s 180 km/h =" 50" m/s
a2 = (Vt-V0) / t = (50-15)/3×60 =" 0.19" m/s2
(3) a3 = (Vt-V0) / t = (-10-10)/0.2 = -100 m/s2
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