70) This problem is asking us to find the net force acting on an object that is traveling in a circular path. We are given that the kinetic energy of the object is 4 Joules, so we can start with this equation.
The problem tells us that the object has a constant kinetic energy, which means that the speed is constant. Since the speed is constant and the object is traveling in a circle of radius 0.2 meters, we can tell that the net force acting on the particle is the centripetal force. We can calculate the centripetal force using this equation.
We have two unknowns in our centripetal force and our kinetic energy. But wait a minute! Both equations have mv^2, so we can solve for mv^2 in our kinetic energy and plug in all our values in the centripetal force equation.
Answer: D
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