two particles A and B are placed in gravity free space at (0,0,0)m and (30,0,0)m respectively. Particle A is projected with a velocity (5i+10j+5k)ms-1 while particle B is projected with a velocity (10i+5j+5k)ms-1 simultaneously. then (A)they will collide at (10,20,10)m (B)they will collide at(10,10,10)m (C)they will never collide (D)none of the above

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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