Question

Choose the correct option with respect to Newton's first law of motion among the following.

• A. It is also called the law of gravitation.
• B. An object at rest can move without any external force acting on it.
• C. An object in motion stays in constant motion unless acted upon by an unbalanced force.
• D. An object in motion may come to rest without any external force acting on it.

Answer 1

The correct option is C An object in motion stays in constant motion unless acted upon by an unbalanced force.

Newton's first law of motion is also called law of inertia.
According to this, an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.