. Sand is being loaded onto a moving cart from a stationary container. Sand leaves the container downward with a mass flow rate of 30 kg/s and a speed of 6 m/s. The cart moves on a horizontal surface with negligible rolling resistance. The empty mass of the cart is 200 kg. At a particular time there is 100 kg of sand in the cart and it is moving to the right at 2 m/s. What is the magnitude and direction of the acceleration of the cart at that time