The shopper pays for his groceries and pushes the shopping cart out of the store, where he encounters a ramp that him move the cart from the sidewalk down to the parking lot. what force accelerates the cart down the ramp?

Gravitational force will accelerate the cart.

Explanation:

In the given case the cart is on a ramp in this situation the gravitational force is applied normally on the cart and its horizontal component which is and its vertical component which is acting along the ramp.

In this situation as we the acceleration is increased by a factor which helps in increasing its acceleration.

Therefore acceleration due to gravity will accelerate the cart.

because if the tool that you are using is not balanced it there would be false mass.