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s-?
t - 4 s.
v - 20 m/s
v= s /t
s = v*t
s = 4 * 20
[s*m/s = m]
s = 80m
t = 4s
s = ?
V0 = 0
s = a*t^2/2 ; ale a = V/t
s = V/t *t^2/2
s = V*t/2
s = 20 m/s * 4 s/2
s = 40 m