A train moves from rest with a uniform acceleration ‘a’. Assuming s=total distance covered in the undirectional motion of train,its total time of journey and maximum speed are(respectively)

(A) (s/a)^1/2 , (as)^1/2

(B)2(s/a)^1/2 , (as)^1/2

(C)(as/a)^1/2 , (as)^1/2

(D)1/2(s/a)^1/2 ,(as/2)^1/2

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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