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Consider the following passage:

Kinetic energy is the energy of motion. An object that has motion has kinetic energy. The amount of kinetic energy that an object in motion possesses depends on its mass (m) and speed (v). The following equation represents the kinetic energy (KE ) of an object: 

Kinetic energy (KE) = ½mv2 

where m = mass in kg of object; v = speed of object. 

Kinetic energy is a scalar quantity; it does not have a direction. The kinetic energy of an object is completely described by its magnitude alone. The unit of measurement for kinetic energy is the joule.

 


If the speed of an object is doubled, then its kinetic energy is

Explanation

The kinetic energy equation, KE = ½mv2 reveals that the kinetic energy of an object is directly proportional to the square of its speed, so if KE is doubled, its speed will increase four times. Choice B is correct

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