1. The problem statement, all variables and given/known data The speed of a 2 kg object changes from 30 m/s to 40 m/s during a 5 s time interval. During this same time interval, the velocity of the object changes in direction by 90 degrees. What average force was applied during the time interval? 2. Relevant equations impulse = F.t 3. The attempt at a solution I know how to find the force if the object hadn't turned. 2 kg (40 - 30) = 20 = F . t F = 4 N But I don't know how to find the force required to move it. The answer is apparently 50N.