Two hot air balloons A and B move in a vertical upward direction with equal uniform velocities of 5m/s along the same line initially ballon A is on the ground and balloon B is at a height of 80m from the ground. A stone is dropped from the ballon B at time t =0 . The time after the stone reaches ballon A is sec . The value of the is

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.

11

21

31

41