Answer :
Acceleration is known to occur whenever an unbalanced force acts on an object.
Acceleration occurs whenever the forces on an object are unbalanced.
It's the group of forces on the object that's either balanced or unbalanced.
There's no such thing as "an unbalanced force".
It's the group of forces on the object that's either balanced or unbalanced.
There's no such thing as "an unbalanced force".