a cart is attached to end of horizontal spring and is moving in SHM with amplitude 0.45 m on frictionless surface. As the cart passes through its equilibrium position, Dr. Sachiko McBride's squirrel, named Jackie, is dropped on the cart from a small height and starts to move together with the cart. The mass of cart is 0.60 kg, a mass of Jackie is 0.12 kg, and the spring constant is 2.3 N/m. Find the velocity of just the cart at the equilibrium position before Jackie is added. Find the velocity of the cart/Jackie combination after Jackie is added to the cart at the equilibrium position. Find the new amplitude of the motion of the cart after Jackie jumps on the cart.