Question

Exercițiul 2 si 3 va rog frumos.

Answer 1

2. x₁=v₁t

x₂=d-v₂t

x₁=x₂=>v₁t=d-v₂t<=>t(v₁+v₂)=d=>t=d/(v₁+v₂)=50/(4+6)=50/10=5 s

x₁=v₁t=6*5=30 m

2->b

3. V=V₁-V₂=40-12=28 cm³

ρ=m/V=>m=ρV=2,5*28=70 g

3->b