A block slides down a smooth inclined plane and then moves on to a rough horizontal surface. Which of the following is/are correct? (Neglect impulsive effect at the bottom of incline)

A body slides down a rough inclined plane and then over a rough plane surface. It starts at A and stops at D. The coefficient of friction is :

A body freely released from A slides down a smooth inclined plane 'AB' and then a rough incline plane 'BC' such that BC = N (AB). If the block comes to rest at C, then coefficient of kinetic friction between the block and inclined plane is?

A block can slide down an a smooth inclined plane of inclination theta , kept on a floor of a lift. When the lift is descending with a retardation a. The acceleration of the block relative to the incline is

A block can slide down an a smooth inclined plane of inclination theta , kept on a floor of a lift. When the lift is descending with a retardation a. The acceleration of the block relative to the incline is