A man is 25m behind a bus, when the bus stars accelerating at 2ms^-2 and the man starts movin with a constant velocity of 10m/s. Time taken by him to board the bus is :

(A) 2s

(B) 3s

(C) 4s

(D) 5s

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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