If a particle of mass "m" is at a distance "y" above the Earth's surface, the gravitational potential energy is given by

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.

Lx bxh