Question

An object is moving at 5 m/s and a few seconds later it is moving at 3 m/s. What had to have happened?

A.The object's net force was 0 N.

B.The object's acceleration increased.

C. An unbalanced force acted on the object

Answer 1

The correct option is C.
From the question given above, it can be seen that the acceleration of the moving object has been reduced from 5 m/s to 3 m/s, this happened because an unbalanced force acted on the object and slowed it down. An unbalanced force is any force that causes a change in motion of a moving object.