Problem: A wooden block of mass 4 kg is attached with a rope to a plastic block of mass 3 kg. They are pulled by force 75 N on a horizontal wooden surface. If the coefficient of kinetic friction between wood and wood is 0.5 and between wood and plastic is 0.4,
Part A: What is the acceleration of the system?
Please help for the above problem, completely confused!! Show each steps if possible, Thanks.