The equations of the normals to the circle x2 + y2 -8x -2y + 12 = 0 at the points whose ordinate is -1, wiii be (1)2x-y-7=0,2x+y-9=o (2)2x+y-7=0,2x+y+9=0 (3)2x+y+7=0,2x+y+9=0 (4)none of these

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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