An object is free to move on a table, except that there is a constant frictional force f that opposes the motion of the object when it moves. If a force of 10.0 N pulls the objects, the acceleration is 2.0 m/s². If a force of 20.0 N pulls the object, the acceleration is 6.0 m/s².

(A) What is the force of friction f ?

(a) 1.0N (b) 3.33 N. (c) 5.0 N.

(d) 10.0 N.

(B) what is the mass of the object?

(a) 0.40 kg. (b) 2.5 kg. (c) 3.33 kg.

(d) 5.0 kg.

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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