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.
a force applied to it
I believe that (A) is the answer.
If a force is applied, it has acceleration: F=ma
But K.E. = 1/2 mv^2. So, as long as it has mass and velocity, it has KE.
To determine the correct answer to this question, let's go over each option and the concept behind it:
A) Momentum: Momentum is the product of an object's mass and its velocity. While an object with momentum is often associated with the motion, simply having momentum does not necessarily imply kinetic energy. Therefore, A) momentum alone does not guarantee an object has kinetic energy.
B) Acceleration: Acceleration refers to a change in an object's velocity. Like momentum, acceleration is related to motion but not specifically to kinetic energy. Thus, B) acceleration alone does not ensure an object has kinetic energy.
C) A force applied to it: The application of a force causes an object to accelerate and, subsequently, gain kinetic energy. When a force acts on an object, it transfers energy to the object, which is converted into kinetic energy. Therefore, C) a force applied to an object is a necessary condition for it to possess kinetic energy.
Considering the explanations provided above, we can conclude that D) All of these is the correct answer.