Question

if the suns gravitational force suddenly vanished, the earths orbit would stop moving instantly. be pulled toward the moon. move in a straight line at a constant speed revolve around mars.

Explanation:

This question relates to the concept of inertia and Newton's first law of motion (an object in motion stays in motion with constant velocity unless acted upon by a net external force). The Sun's gravitational force keeps Earth in orbit; if it vanishes, Earth, having a tangential velocity, will move in a straight line at constant speed (no net force to change its motion). Other options are incorrect: Earth won't stop instantly (no force to stop it), the Moon's gravity is much weaker and not enough to pull Earth toward it, and Mars' gravity is also too weak to capture Earth's orbit.

Answer:

move in a straight line at a constant speed