A rod of length I leans by its upper end against a smooth vertical wall, while its other end leans against the floor. The end that leans against the wall moves uniformly downward. Then:

A uniform ladder which is 5m long has a mass of 25kg , leans with its upper end against a smooth vertical wall and its lower end on rough ground. The bottom of the ladder is 3m from the wall. Calculate the frictional force between the ladder and the ground . (g=10ms^(-2) )

A rod of length 'l' is inclined at an angle 'theta' with the floor against a smooth vertical wall. If the end A moves instantaneously with velocity v_(1) , what is the velocity of end B at the instant when rod makes 'theta' angle with the horizontal.

A rod of length 'l' is inclined at an angle 'theta' with the floor against a smooth vertical wall. If the end A moves instantaneously with velocity v_(1) what is the velocity of end B at the instant when rod makes 'theta' angle with the horizontal .