Answer on Mechanics | Relativity Question for Krystian
1) how big power do you need to use to make 1 kg body fly up to 50 meters ?
energy conservation law:
mv^2/2=mgh where m -mass of the body, v - initial velosity, h=50m
hence v=sqrt(2gh)=31 m/s
When making body to move force will do work A=mv^2/2/ where v -initial velosity
So A=1*31^2/2=490,5 joules -& work done to make body fly up to 50m
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Ahh ; / I've made a mistake when translating the question. That should be "How big force"