Question

how much force is needed to keep a moving body in motion according to Newton's first law ?​

Answer 1

Answer:

According to Newton's first law, a non-zero net force is required to change the velocity of an object.

Answer 2

Answer:

Force is not required to keep a moving body in motion. But, if we want to change the speed or direction of the moving object—then we need to apply some external force on the moving body, so, that it can change its speed or direction.

$\bold \red{Celestial} \bold{Centrix}$

More information:

First law of motion: The first law of motion states that, a body would continue being at rest or would continue moving at some speed unless and until an external force is applied on it. This is also called the law of inertia.

Second law of motion: The rate of change of momentum is directly proportional to the acceleration produced and the force applied.

Third law of motion: Action is always equal to reaction.