The shortest path covered by an object is called displacement of a particle while the overall path covered by it during entire journey is called distance covered by it.
In this case, an object goes from one point in space to another. After it arrives at its destination, its displacement is either smaller than or equal to the distance traveled. As distance covered is the overall path, so the displacement is less than distance traveled.
So, the correct option is 4 (either smaller than or equal to). Hence, this is the required solution.
they meet from the girl's original position at: 2.37 (meters)
Explanation:
We need to use the Newton's law, exactly the second law that relate force, mass and acceleration as: with this we can get both accelerations; solving for acceleration . Now and. Then knowing that they both travel at the same time and assuming that the distance among the girl and the sled is: 15.0-x, so, and, solving for the time we get: and with this equations we solving for the x that is the distance between the girl and the sled after the apply the force and we get:. Finally we get: and replacing the values we have got: so so x=2.37 (meters).