A particle initially at rest is subjected to two forces

One is constant, the other is a retarding force proportional to the particle velocity. In the subsequent motion of the particle, the acceleration:

1. wil increase then decrease
2. Will decrease then increase
3. Will decrease to zero
4. Will decrease and become constant at some non zero value. Please explain the answer.

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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