1) 用 s=ut+0.5at^2
s1=0.5*5+0.5*(5^2)a----1
s2=0.5*9+0.5*(9^2)a----2
2-1:
4=2+16a
a=0.25m/s^2
2)
s=ut+0.5at^2
s=0.5*9+0.5*0.25*9^2
s=14.625m
1) 用 s=ut+0.5at^2
s1=0.5*5+0.5*(5^2)a----1
s2=0.5*9+0.5*(9^2)a----2
2-1:
4=2+16a
a=0.25m/s^2
2)
s=ut+0.5at^2
s=0.5*9+0.5*0.25*9^2
s=14.625m