A 3.0-kg cart on a frictionless horizontal surface is connected with an ideal string and an ideal pulley to a 4.0-kg hanging mass. The hanging mass is initially held a height of 0.45 m above the ground. The hanging mass is released. How fast is the hanging mass going as it hits the ground? The same cart and hanging mass given above are released from rest. How far has the cart traveled by the time it reaches a speed of 1.00 m/s