5. An object that has kinetic energy must have
A) momentum.
B) acceleration.
C) a force applied to it.
D) All of these.
E) None of these.
To determine the correct answer, let's consider the definition and characteristics of kinetic energy. Kinetic energy is the energy possessed by an object due to its motion. It depends on both the object's mass and its velocity.
When an object is moving, it possesses momentum, which is the product of its mass and velocity. So, answer choice A) momentum is correct since an object with kinetic energy will also have momentum.
Acceleration, on the other hand, is the rate of change of velocity. Although an object with kinetic energy may have an acceleration if its velocity is changing, it is not a requirement for an object to have kinetic energy. Therefore, answer choice B) acceleration is not necessary for an object to possess kinetic energy.
Lastly, a force is not necessarily required for an object to have kinetic energy. Kinetic energy can be obtained through various means, such as an initial push, gravitational potential energy conversion, or conversion from other forms of energy. Therefore, answer choice C) a force applied to it is not always required for an object to possess kinetic energy.
Considering the explanations above, the correct answer is D) All of these, as an object with kinetic energy will also have momentum, and it may have acceleration and/or have had a force applied to it.