Question

Exercițiul 26 vă rog!!
15 puncte​

Answer 1

a) v₀=90 km/h=25 m/s

v=0

v=v₀+a*t₂<=>0=25+20a=>a=-25/20=-1,25 m/s²

b) vm=(v+v₀)/2=(25+0)/2=25/2=12,5 m/s

c) d₂=v₀t+at₂²/2=25*20-1,25*20²/2=500-250=250 m

d) AS=d₁+d₂=>d₁=AS-d₂=500-250=250 m

d₁=v₀t₁=>t₁=d₁/v₀=250/25=10 s

t=t₁+t₂=10+20=30 s