Hunter is riding an elephant of height 4 m moving in a straight line with uniform velocity of 2 metre per second. A deer starts running with uniform velocity from a point 4×(5)^0.5 away in front of elephant along a line perpendicular to velocity of the elephant. If Hunter can throw his Spear with a speed of 10 m/s relative to the elephant at what angle to its direction of motion must He throw his Spear horizontally for a successful hit

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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