On a slope where does a marble have to most kinetic energy? a) it is always the same
b) at the initial position
c) at the final position
d) somewhere between the initial and the final position

C

Explanation:

Kinetic energy is the energy of motion. It has the most potential energy at the top but the most kinetic at the bottom after it's accelerated fully down the slope.

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it