Whats a difference between a objects kinetic energy and potential energy

A object having kinetic energy is in motion state.And the object whi posses potential energy i s in state of podition.

Objects are relative to other moving and stationary objects.

Kinetic energy can be transferred from one moving object to another.

Potential energy is stored energy in an object.

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

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adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.