According to Newton's First Law, what potential impact can an unbalanced force can have on an object in motion?

a
An unbalanced force will have no impact on an object in motion
b
An unbalanced force can only change the object's direction
c
An unbalanced force can change both the object's direction and speed
d
An unbalanced force can only change the object's speed

c

An unbalanced force can change both the object's direction and speed

According to Newton's First Law of Motion (also known as the Law of Inertia), an object at rest will stay at rest, and an object in motion will continue in motion with a constant velocity (which implies a constant speed and direction) unless acted upon by an unbalanced force. An unbalanced force can thus change the speed of an object (accelerate or decelerate it) and/or change the direction in which it is moving.