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2Ek=mv2 /v2
m=2Ek//v2
Ek=2kJ=2000J
v=25km/h=6,94m//s
m=2*2000J//(6,94)2
m=4000j2//48,2m2//s2
m=82 kg
to jaki wynik wyjdzie to kwestia zaokrąglenia