Question

according to newtons second law of motion, when an object is acted on by an unbalanced force, how will that object respond? it will increase velocity. it will decrease speed. it will accelerate. it will stop moving.

Explanation:

Newton's second law of motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass ($F = ma$, where $F$ is force, $m$ is mass, and $a$ is acceleration). An unbalanced force means there is a net force, so the object will accelerate. "It will increase velocity" is not always accurate (acceleration can also decrease velocity if force is opposite to motion, but the key effect is acceleration). "It will decrease speed" is incorrect as unbalanced force causes acceleration (change in velocity, which can be speed up, slow down, or change direction). "It will stop moving" is incorrect as an unbalanced force causes a change in motion (acceleration), not necessarily stopping.

Answer:

C. It will accelerate.