S1=Vо*t1+а*t1^2\2
S1+S2=Vо*(t1+t2)+a*(t1+t2)^2\2
2*S1=Vо*2*t1+а*t1^2
S1+S2=Vo*2t1+а*4t1^2\2
S1-S2=-а*t1^2
а=-2\1=-2 м\с2 - ответ
IaI=2 м\с2
S1=Vо*t1+а*t1^2\2
S1+S2=Vо*(t1+t2)+a*(t1+t2)^2\2
2*S1=Vо*2*t1+а*t1^2
S1+S2=Vo*2t1+а*4t1^2\2
S1-S2=-а*t1^2
а=-2\1=-2 м\с2 - ответ
IaI=2 м\с2