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2009-12-29T22:07:53+01:00
F1 = 20 N
Ft = 5 N
t = 5s
s = 25 m

m = ?

Fw = 20 N - 5 N = 15 N
Fw = 15 N

V = s/t
V = 25 m / 5 s
V = 5 m/s

F = m *a
a = V/t

F = m*V/t / *t
F * t = m * V / :V
m = F*t/V

m = 15 N * 5 s/ 5m/s
m = 15 kg