A tank cart is filled with water as shown in the figure. The initial mass of the cart with water is m0=100 kg. At time t=0, a hole is made in the left wall of the cart and water starts spilling out from the cart, with a constant velocity of vr=10 m/s with respect to the cart. The rate of ejection of water is r=2 kg/s. Find the acceleration of the cart after time t=5 s.