Venus is the hottest world in the solar system. Although Venus is not the planet closest to the sun, its dense atmosphere traps heat in a runaway version of the greenhouse effect that warms Earth.
That's a battery or other "power supply".
When the spring is compressed, the potential energy stored in the spring is:

where k=880 N/m is the spring constant and

is the compression of the spring. By using these numbers, we get

When the spring is released with the ball over it, all the potential energy is converted into kinetic energy of the ball:

So by using m=0.300 kg, and re-arranging the formula, we can calculate the velocity of the ball: