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t = 4 s
a = 5 m/s²
W = ?
W = F * s
F = m * a
s = (a * t²) / 2
W = m * a * [(a * t²) / 2]
W = [m * (a * t)²] / 2
W = [10 * (5 * 4)²] / 2
W = 2000 J
Odp.: Należy wykonać pracę równą 2000 J.