Asingle proton has which electrical charge?
a-no charge
b-positive charge
c- negatively charge

The answer is B- a positive charge 

B. A single proton has +1 charge. 
*I'm pretty sure* 

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.