a force act on a 2.80 kg particle in such a way that the position of the particle as a funcation of time is given by x=3t-4t^2+t^3, where x is in meter and t is in second. (a) find the work done by the force during the first 4.0 s (b) at what instsntineous rate is the force doing work on the particle at the instant t=3 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.

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