Which of these is a good example of newton's first law of inertia

Its is A

Explanation:

Which of these is a good example of Newton's First Law of inertia  

A)  

a ball sits motionless on the ground  

B)  

a ball gathers speed as it rolls downhill  

C)  

a ball accelerates as it falls out of the classroom window  

D)  

a ball slows down after it is kicked through the grass

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

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