When external forces acting on an object are balanced, what will happen to the object

The objects morion will remain the same

Explanation:

7.40m/s

Explanation:

The masses of the cars with their respective initial velocities are;

Since the two car stuck after collision, they all move with a common velocity in the same direction.

Let the velocity at which the two cars will be moving after collision be V.

From the conservation of momentum, in a closed system, momentum before collision is equal to momentum after collision.

Mathematically,

By substitution, we obtain;

Dividing through by 408, we obtain

Therefore,v=7.40m/s