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F- siła
F-T=ma
F= ma+T ....................... a=v/t
F= mv/t+T
F= 2kg*5m/s/10s + 4N
F= 1N+4N
F=5N
f=10 s /4N
f= 2,5 N/s
2,5 N/s * 2kg=5N*kg/s