1 A plank with a box on it at one end is gradually raised

Last updated: 6/1/2023

1 A plank with a box on it at one end is gradually raised about the other end As the angle of inclination with the horizontal reaches 30 the box starts to slip and slides 4 0 m down the plank in 4 0s The coefficients of static and kinetic friction between the box and the plank will be respectively 1 0 4 and 0 3 2 0 6 and 0 6 3 0 6 and 0 5 4 0 5 and 0 6 mg 0 S