A cart is rolling across the floor at a constant velocity of 2 m/s to the right. The cart is pushed again to the right, and it starts to accelerate. How are the force of the push and acceleration of the cart related?

AThe force and acceleration are not related.

BThe force of gravity makes the car accelerate.

CThe balanced push causes the cart to accelerate.

DThe unbalanced push causes the cart to accelerate.