Select the correct answers

A particle is projected vertically upwards in vacuum with a speed u. Then

A) When it rises to half its maximum height, its speed becomes u/2.

B)When it rises to half its maximum height, its speed becomes u√2

C)The time taken to rise to half its maximum height is half the time taken to reach its maximum height.

D)the time taken to rise to three-fourth of its maximum height is half the time taken to reach its Maximum height

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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