Question

puteti sa ma ajutati va rog?

problema I.10.28

Answer 1

x₁=v₁t

x₂=d-v₂t

x₁=x₂=>t(v₁+v₂)=d=>t=d/(v₁+v₂)

x₁=d/4

d/4=v₁*d/(v₁+v₂)<=>v₁+v₂=4v₁<=>v₂=3v₁

d=v₂t'

d=v₁(t'+Δt')

v₂t'=v₁(t'+Δt')<=>3t'=10+t'<=>t'=10/2=5 min

t"=t'+Δt'=5+10=15 min