a ball is dropped from the top of a building.the ball takes 0.5 sec to fall past the 3m height of a window some distance from the top of building.if the speed of the ball at the top and at the bottom of the window are v and u then

a.v+u=12m/s b.v-u=4.9m/s

c.vu=1m/s d.v/u=1m/s

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