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t = 4s
s=at^2/2
s1= 36x 4^2 / 2 = 18 x 16 = 288 m
a=36 m/s
t2 = 12s
s2= 36 x 12^2 /2 = 18 x 144 = 2592 m
Sc = s1 +s2
Sc = 2880 m
a2 = ?
t2 = 12s
s2 = 2880 m
s=at^2/2
2s = at^2
a = 2s/t^2
a = 5760 / 144 = 40 m/s^2
znak x^2 - to x do potegi drugiej