Calculate the resistance of a copper conductor with a length of 3km and diameter of 5mm. take the resistivity of the copper as 0,0173 ​

Kinetic energy = 1/2mv^2. since the mass is constant we can form a ratio of it's kinetic energy at 60 divided by that at 30 to see ke(60)/ke(30) = +(60^2)/30^2). this may be said to 300% increase.