Final answer:
When the engine is shut off on a forward-moving PWC, it will continue moving forward due to inertia and gradually slow down until it stops, as per Newton's First Law of Motion.
Step-by-step explanation:
When you put the throttle to idle, or shut off the engine on a forward-moving PWC (Personal Watercraft), the correct answer is (A)The PWC continues moving forward until it slows down naturally. This occurs due to the principle of inertia, as described by Newton's First Law of Motion, which states that an object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force. In the case of the PWC, once the throttle is cut, the PWC will decelerate due to the resistance from the water but will continue to move forward until all kinetic energy is dissipated and it comes to a complete stop. This process involves the kinetic energy of the PWC being converted into other forms of energy, mainly heat, due to the force of friction against the water.