Question

Answer 1

a) Đúng

b) \(v_{13}=35\left(km/h\right);v_{23}=27\left(km/h\right)\)

\(v_{12}=v_{13}-v_{23}=35-27=8\left(km/h\right)\)

\(\Rightarrow\) Đúng

c) \(s_1=35t;s_2=20+27t\)

Để 2 xe gặp nhau \(s_1=s_2\Leftrightarrow35t=20+27t\Leftrightarrow8t=20\Leftrightarrow t=2,5\left(h\right)\)

\(\Rightarrow\) Đúng

d) \(s_A=s_1=35t=35.2.5=87,5\left(km\right)\)

\(s_B=s_2=20+27t=20+27.2,5=87,5\left(km\right)\)

\(\Rightarrow\) Đúng