The answer is C. I hope I helped!
Answer:
3 N to the right
Explanation:
There are two forces acting on the car:
- A force of 10 N towards the right
- A force of 7 N towards the left
Therefore, the net force is given by the difference between the two, since they are in opposite directions:

And the direction is to the right, since the force to the right has greater magnitude than the force to the left.
4. a poor insulator
If rest other things are kept constant or unchanged then a good conductor can be termed as a poor insulator.
I would think that you would have to do 42/2=21Hz, but I'm not sure...
Potential energy is energy stored in an object. kinetic energy is energy of motion