[SOLVED] Need help on a Newton's Laws problem :( 1. The problem statement, all variables and given/known data A 56 kg ice skater holds up a large sheet of cardboard that can catch the wind and drive her (frictionlessly) across the ice. While she's moving at 0.5 m/s, a wind that is constant and horizontal for 5.0 s exerts a force on the cardboard of 2.1 N. What is the skater's initial acceleration once the wind begins to blow? 2. Relevant equations f=ma a=change in velocity/change in time 3. The attempt at a solution I'm not sure how to find the initial acceleration. I know how to find the average acceleration though.