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Ek= m*v²/2 /*2
2Ek=m*v² //:v²
m=2Ek/v²
Ek=m*v²/2 /*2
2Ek=m*v² //:m
v²=2Ek/m
v=√2Ek/m
b)
Ep=m*g*h //:g*h
m=Ep/g*h
Ep=m*g*h //:m*g
h=Ep/m*g