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t= 4/60 = 1/15 jam
vrata² = s/t
= 1 /1/15
= 15 km /jam
b. s= 1 km
= 100.000 cm
t= 4 menit
= 4x60
= 240 s
v = 100.000/240
= 1250/3
= 416,67 cm /s