cialo o masie 0,5kg spadalo i w czasie 4s uzyskalo predkosc 30m/s. jaka zostala wykonana praca przeciwko sile oporu powietrza?
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a = Δv/t
Δv = 30m/s
t = 4s
a = 30m/s/4s = 7,5m/s²
W = Fs
F = mg
F = 0,5kg x 10N/kg = 5N
s = at²/2
W = 5N x 7,5m/s² x (4s)²/2 = 300J
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