1. The problem statement, all variables and given/known data If the resultant force acting on a 2.0kg object is equal to (3i + 4j) N, what is the change in kinetic energy as the object moves from (7i -8j)m to (11i -5j)m 2. Relevant equations w = Fd Ek = 1/2mv2 3. The attempt at a solution I assumed that Ek = w so I tried to solve it by getting the change in displacement and then getting the dot product using the given force (did not use the mass at all) d= (11i -5j) - (7i -8j) = (4i +3j) w= (3i +4j)(4i + 3j) = (12i + 12j) |w| = 17 J ... this answer was totally wrong, as the answer should be 24 J. I can't really grasp the relationship with force and kinetic energy.. would appreciate some help. thank you.