A 0. 50 kg object is at rest. A 3. 00 n force to the right acts on the object during a time interval of 1. 50 s. A. What is the velocity of the object at the end of this interval? b. At the end of this interval, a constant force of 4. 00 n to the left is applied for 3. 00 s. What is the velocity at the end of the 3. 00 s?.