Объяснение:
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1)f1=15kh 2)f1=60h 3)f=2h 4) m=0, 2кг a1=0, 5m/c2 a1=0, 8m/c2 x=4cm t=5c f2=60 kh a2=2m/c2 k-? f=0, 1h a2-? f2-? v-?