Odpowiedzi

2009-10-19T19:51:58+02:00

dane:
v₀ = 15 m/s
t = 6 s
s = 60 m

szukane:
v = ?

a = (v₀ - v)/t
s = v₀t - at²/2

s = v₀t - (v₀ - v)/t * t²/2
s = v₀t - (v₀ - v)t/2
2s/t = 2v₀ - v₀ + v
v = 2s/t - v₀

v = 2s/t - v₀ = 2*60m/(6s) - 15m/s = 20m/s - 15m/s = 5 m/s

v = 5 m/s

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