Newton's first law of motion states that objects in motion stay in motion unless acted on by an outside force. If this is true, why does a cannonball that is fired upwards on Earth eventually fall downwards? Group of answer choices The cannonball is acted on by the force of gravity. This will not actually happen; the cannonball will continue upwards. The cannonball is traveling too fast for Newtonian physics to apply. Heavy objects seek a low altitude by nature