28. ats san 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.Os. The coefficients of static and kinetic friction between the box and the plank will be, respectively : the dire spe mg If pd V (x (in N (1) 0.4 and 0.3 (3) 0.6 and 0.5 Two ste (2) 0.6 and 0.6 (4) 0.5 and 0,6 (1) 29.

A plank with a box on it at one end is gradually raised about the other end. As the angle of invlination 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: .

A plank with a box on it at one end is gradully raised about the other end. As the angle of inclination with the horizntal reaches 30^(@) , the box starts to slip and slide 4.0m down the plank in 4.0s . The coefficients of static and knitic friction between the box and the plank will be, respectively.

A plank with a box on it at one end is gradully raised about the other end. As the angle of inclination with the horizntal reaches 30^(@) , the box starts to slip and slide 4.0m down the plank in 4.0s . The coefficients of static and knitic friction between the box and the plank will be, respectively.

A plank with a box on it at one end is gradully raised about the other end. As the angle of inclination with the horizntal reaches 30^(@) , the box starts to slip and slide 4.0m down the plank in 4.0s . The coefficients of static and knitic friction between the box and the plank will be, respectively.

A plank w ith a box on it atone end is gradually raised about the other end . As the ang le of in clin ation with the horizontal reaches 30^(@) , the box starts to slip and slides 4.0 m down the plan k in 4.0s. The coefficients of static and k inetic friction between the box and the plank will be, respectively:

A student wants to determine the coefficients of static frction and kinetic friciton between a box and a plank. She places the box on the plank and gradually raises on end on of the plank. When the angle of inclination with horizontal reaches 30^(@) , the box stars to slip, and it then slides 2.5m dwon the plank in 4.0 s at constant acceleration. What are (a) the coefficient of static frictio and (b) the coefficient of kinetic friction between the box and the plank ?

A force of 750 N is applied to a block of mass 102 kg to prevent it from sliding on a plane with an inclination angle 30^@ with the horizontal. If the coefficients of static friction and kinetic friction between the block and the plane are 0.4 and 0.3 respectively, then the frictional force acting on the block is

A force of 750 N is applied to a block of mass 102 kg to prevent it from sliding on a plane with an inclination angle 30^@ with the horizontal. If the coefficients of static friction and kinetic friction between the block and the plane are 0.4 and 0.3 respectively, then the frictional force acting on the block is

A block of mass 2 kg slides down an incline plane of inclination 30°. The coefficient of friction between block and plane is 0.5. The contact force between block and plank is :