Odpowiedź:
4.
a)
a = ΔV / Δt
ΔV = 4 m/s
Δt = 20 s
a = 4/20 = 1/5 [m/s2]
b)
a = ΔV / Δt
ΔV = 5 - 4 = 1 m/s
Δt = 30 - 20 = 10 s
a = 1/20 m.s2
c)
V = s/t
s = V * t
t= 100 - 30 = 70
V = 5 m/s
s = 70 * 5 = 350 m
1. P F
2. B
3.
s = 2km = 2000 m
s₁ = 1/2 s = 1 km
t₁ = 200 s
s₂ = 1/2 s = 1 km
t₂ = 250 s
1. F
V śr = s / t₁ + t₂
Vśr = 2000 m / 200 s + 250 s = 2000 m /450 s = 4,4 s
2. P
