传播健康传递爱健康经典语录
present health transfer love
翻译:to transmit love by caring
璋辖钪惧害甯锠
不用怕哦!大胆一点!
Great love is beyond words. Actions speak louder than words.
(1)物体前2s内做匀加速直线运动,后2s做匀速直线运动,设前2s内物体的加速度为a,则:a=v/t=(2/2)m/s2=1m/s2
(2)由牛顿第二定律Ff=umg=ma U=a/g=0.1
(3)设物体在前2s内的位移为x1,后2s内的位移为x2,则物体通过的总位移:x=x1+x2=6m