A) energy cannot be created nor destroyed
The student that measured the mass to be 16110g got closest to the known result. She is off by 10 g.
Explanation:
The object stops moving in 5 places (namely B, D, F, H, and position after 28 seconds which isn't marked ).
We know that the object has stopped moving, since its position does not change with the passage of time i.e. at rest.
Physical development , Cognitive Development , psychosocial development I think!