1. The problem statement, all variables and given/known data A duck of mass 40kg is being pulled by a spring with k = 900N/m. If μk = 0.6 between the duck and the road, find the acceleration of the duck given that the spring stretches 0.4m. 2. Relevant equations Fspring = kx, where k = spring constant and x = stretch of spring Fnet = ma 3. The attempt at a solution Fspring = kx F = 900N/m(0.6m) F = 540N That's about as far as I got before not knowing what to do next.