Radiation is the flow of energy by means of electromagnetic waves.
The dependent variable is the amount of time it takes for the water to boil. This variable is dependent because is depends on the amount of salt.
Explanation:
According to Newton's second law of motion, the rate of change of momentum is directly proportional to the applied unbalanced force. The mathematical expression is given by:

Where
F is the applied force
m is the mass of the object
v is the velocity with which it is moving

Momentum of a particle is given by the product of mass and velocity as :

Hence, this is the required solution.
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