Question

the law of ____________ is defined as: \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.\ a kinetic energy b inertia c conservation of energy d momentum

Explanation:

• Kinetic energy is the energy of motion ($KE=\frac{1}{2}mv^{2}$), not a law.
• The law of inertia (Newton's first law) states that 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.
• Conservation of energy states that energy cannot be created or destroyed, only transformed.
• Momentum ($p = mv$) is the product of mass and velocity, and there is a law of conservation of momentum, but it's not described by the given statement.

Answer:

B. Inertia