Which of the following best represents potential energy being converted to kinetic energy?
1)a roller coaster starts at the top of a hill and then rolls down the hill.
2)a pitcher throws a baseball, and then the batter hits a homerun
3)a man jogs around the block and then stops to drink an energy drink
4)a woman peddles her bicycle across town and back again.

"A pitcher throws a baseball, and then the batter hits a homerun" is the one among the following choices given in the question that best represents potential energy being converted to kinetic energy. The correct option among all the options that are given in the question is the second option or option "2". 

Yes, in case of uniform velocity

Explanation:

This is the case of uniform velocity. If a body covers equal displacement in equal intervals of time, then the velocity of a body is said to be ‘Uniform Velocity’. It meas that the velocity of a body remains constant during the motion and it does not change.

Since, acceleration is defined as the rate of change of velocity.

Therefore, if there is no change in velocity or in other words the change in velocity is zero, then the acceleration is also zero.

a = ΔV/t = 0/t

a = 0 m/s²

So, the acceleration of the body is 0 m/s², but it has a uniform velocity

Hence, it is possible for an object that, object with zero acceleration have velocity, which is the case case of uniform velocity.