A river of width w is flowing with a uniform velocity V . A bpat starts moving from point P also with velocity V relative to the river . The direction of resultant velocity is always perpendicular to the line joining boat and the fixed point R .point Q is on the opposite side of the river P , Q and R are in a staight line .If PQ=QR= w find (a) the trajectory of the boat (b) the drifting of the boat and (c) the time taken by the boat to cross the river.

Three identical balls are placed on a frictionless horizontal surface touching each other. They stick to each other because of adhesive. Another ball of same radius and mass m is placed over the void created by the three balls. Find the forces applied by the balls kept on the floor to each other if the system remains in equilibrium.

A car loaded with water having total mass 1000 kg moves on a straight horizontal Road starting from rest under the action of a force of 100 Newton. The water spills throw a small hole in the bottom at a rate of 0.1 KG per second the velocity of cart after 300 seconds is nearly.

11

21

31

41