two balls of equal masses are thrown upwards , along the same vertical direction at an interval of 2 seconds , with the same initial velocity of 40m/s. Then these will collide at a height of (Take g=10m/s²)

1. 120m
2. 75m
3. 200m
4. 45m

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