Force=mass x acceleration which of newtons laws does this best describe

Arunner is training for an upcoming marathon by running around a 100-m-diameter circular track at constant speed. let a coordinate system have its origin at the center of the circle with the x-axis pointing east and the y-axis north. the runner starts at (x, y) = (50 m, 0 m) and runs 2.5 times around the track in a clockwise direction.

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?

Which of these metals are magnetic?