A particle at a height h from the ground is projected with an angle of 30 from the horizontal strikes the ground making an angle of 45 with horizontal . It is again projected from the same point bit now with an of 60 with horizontal find the angle it makes with horizontal when it strikes the ground.

(A) tan inverse 4

(B) tan inverse 5

(C) tan inverse root 5

(D) tan inverse root 3

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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