Besides its weight, a 2.8kg object is subjected to one other constant force. The object starts from rest and in 1.2s experiences a displacement of (4.2m)i-(3.3m)j, where the direction of j is the upward vertical direction. Determine the other force. 1. if j is the upward vertial direction, does that mean -(3.3m)j is in the downwards direction? 2. There is only one force, why does it ask for "the other force." 3. To find this force, do I just find the acceleration from 0 to the resultant displacement and then multiply that by the mass?