Question

一个物体由静止开始做匀加速直线运动,在t秒内通过的位移是s米,则物体在秒末的速度为什麽?物体

Answer 1

(0+v末)/2t=s

v末=2s/t

a=v末/t=2s/t^2

s(1/3)=1/2*(2s/t^2)a*(1/3)^2=s/(9t^2)

s/3=1/2*(2s/t^2)*T^2=(s/t^2)T^2

T^2=s/3*t^2/s=t^2/3

T=t/根号3