Specific heat refers to the amount of heat required to change 1 gram of a substance by degree(s) celsius.

1 Degree Celsius because it is equal to one Kelvin.

Answer;

One degree Celsius

Specific heat refers to the amount of heat required to change 1 gram of a substance by 1 degree(s) Celsius.

Explanation;Specific heat capacity is the amount of heat that should be added or removed from a unit mass of a substance to change its temperature by one degree Celsius.It is an intensive property which describes how much heat should be added to 1 gram of a given substance to raise its temperature by 1 degree Celsius. It is measure in J/kg/°C or J/kg/K.

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.