Which of the following objects has the greatest kinetic energy?

a baseball flying through the air at 20 miles per hour
a baseball flying through the air at 90 miles per hour
a baseball sitting on the ground
a baseball flying through the air at 45 miles per hour

A baseball flying through the air at 90 miles per hour.

Explanation:

Kinetic energy is a type of energy that an object has because of its motion. In this example, a baseball that is flying through the air would have kinetic energy because of this movement. In order to move this object, a force needs to be applied to it. In order for us to know the kinetic energy of an object, we have to look at both the mass and the speed. In this case, this ball would have the greatest kinetic energy because it has the greatest speed.

continuous conducting path for current, power supply

not too sure thinking all accelerations are pointed down