Adog runs in a straight line along the x-axis to retrieve a thrown toy. the dog starts from rest at x = 0 at time t = 0, runs to x = +15.0 m and comes momentarily to rest there at t = 4.0 s, turns around and runs back past x = 0 at time t = 7.5 s, and finally comes to rest again at x = -10.0 m at t = 10.0 s. in order to start and stop moving at appropriate points, the dog accelerates smoothly as necessary. in answering these questions, it may if you draw a sketch of the situation, marking the dog's position at various times. what is the dog's displacement (in m) for the entire trip?

the displacement is -10m or 10m on the (-)X axis.

Explanation:

We know that the displacement is a vectorial value,it has a magnitude and a direction.

So in order to obtain the total displacement we have to sum the distance on each trame taking the direction into consideration, we will refer to the right side of the X axis as positive.

On the first stretch, the dog ends up at 15m on the right side, then came back to  x=0m and kept going 10 m more.

so the total displacement is -10m or 10m on the -X direction.

i would say the answer is food.

hope this !

energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. do not understand what you are asking but hope this