X1=1/2*a*t^2=32m
X2=V*1s=a*(t-1+t)/2*1s=14m
所以,a*t^2=64m a*(2t-1)=28m
解得,t1=4/7s,a1=196m/s^2 t2=4s,a2=4m/s^2
又因为,t>1s,
所以,t=4s,a=4m/s^2
X1=1/2*a*t^2=32m
X2=V*1s=a*(t-1+t)/2*1s=14m
所以,a*t^2=64m a*(2t-1)=28m
解得,t1=4/7s,a1=196m/s^2 t2=4s,a2=4m/s^2
又因为,t>1s,
所以,t=4s,a=4m/s^2