A cart is rolling across the floor at a constant velocity of 2 m/s to the right.

The unbalanced push causes the cart to speed up.

Explanation:

given data

constant velocity = 2 m/s

solution

as here when the application of an unbalanced force ( push up ) that causes the cart to more speed up

and  When that  cart is in the constant motion then the forces is balance and there will be no any more speed up.

so when an unbalanced force are added then the cart speed will be  change.

so correct answer is The unbalanced push causes the cart to speed up.

hope this !

explanation: