Question 3 of 16 Which statement correctly describes magnetic field lines?
A. They form loops by joining north pole to south pole.
B. They are parallel with one another.
C. They show the direction a south pole will point.
D. They form loops by joining positive charge to negative charge.

You throw a small rock straight up from the edge of a highway bridge that crosses a river. the rock passes you on its way down, 7.00 s after it was thrown. what is the speed of the rock just before it reaches the water 28.0 m below the point where the rock left your hand? ignore air resistance.