A 20-kg cart is connected to a 40−kg cart by a relaxed spring of epting constant 1000 N/m. and What is the accelecation of 20−kg cart at the instant you begin to push? Assume that the Grection of pish both carts are placed on a low. friction track You is the positve direction push the 20-ky cart in the direction of the Express your aniswer with the appropriate units.