hockey45

please delete sorry

hi guys, i am having trouble with this problem. Calculate the average force of friction acting on a wood block as it is propelled along the floor by an elastic band ? my solution and my ideas: What does it mean by average froce of friction? I first weighed the peice of wood to find its mass. i then used a newton scale and pulled the elastic band 60 cm and found the force of friction which was 8n. is this force applied(8n)?did i measure the force correctly of the elastic.?i have no idea where to go from here. is there any kinetic energy involved? do i use Ek=1/2 mv^2. any suggestions would be helpful. do i time the wodeen block after i let it go and find the velocity. i am sure it is uniform acceleration. thank you.