A ladder 3 m long and weighing 200 N has its centre of gravity 120 cm from the bottom. At its top end is a 50 N weight. The work required to raise the ladder from a horizontal position on the ground to a vertical position is

A block loses 20% of his velocity after moving through 108 m. The maximum distance covered by the block in subsequent motion is (assume uniform retardation

Two bodies have same kinetic energy. They are stopped by applying same retarding force.Which body will stop first?

A person of mass 60 kg carries a 15 kg body on the top of building 10 m high in 5 minutes.He puts a power in carrying the body

If the centre of gravity of an object which is slightly disturbed and the object returns to its original position when the disturbing force is removed, the object is said to be in