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2.
m=3N/1,5m/s²=4N/a₂
a₂=1,5m/s²*4N/3N=2m/s²
1/ m = F/a = 90N/15m/s2 = 6kg
2/ m = F1/a1 = F2/a2 czyli a2 = F2*a1/F1 = 4N*1,5m/s2/3N = 2m/s2
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