Two men A and B are standing on a plank. B is at the middle of the plank and A is at the left end of the plank. Surface of the plank is smooth. System is initially at rest and masses are as shown in the figure. A and B starts moving such that the position of B remains fixed with respect to ground then A meets B. Then the point where A meets B is located at-

A.the middle of the plank

B.30cm from the left end of the plank

C.the right end of the plank

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.

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