Determine the mechanical energy of this object: a 1-kg ball sits on a 10-meter high cliff.

a. the ball isn't moving, so the mechanical energy is zero
b. 10 j
c. 98 j
d. 980 j

also could you explain how you did it because i have know idea how to solve it

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b.b. at twice the distance, the magnitude of the field is 2b.c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.