Aplank with a mass m = 5.20 kg rides on top of two identical, solid, cylindrical rollers that have r = 4.00 cm and m = 2.00 kg. the plank is pulled by a constant horizontal force f with arrow of magnitude 4.80 n applied to the end of the plank and perpendicular to the axes of the cylinders (which are parallel). the cylinders roll without slipping on a flat surface. there is also no slipping between the cylinders and the plank.
1. find the initial acceleration of the plank at the moment the rollers are equidistant from the ends of the plank. magnitude - 1 m/s²
2. find the acceleration of the rollers at this moment. magnitude - 3 m/s²
3. what friction forces are acting at this moment? (let fp be the frictional force exerted by each roller on the plank, and let fg be the rolling friction exerted by the ground on each roller.)
fp = 5 n fg = 7 n