Is there a specific way to determine the function of a given graph?if not, 

Then how will we solve the following question?

the accelaration – time graph of a particle is such that at t=0, a= -2, and at t=1, a=0. (I cant draw the graph so i am giving data deducable form graph)

(i) Find an expression of velocity in terms of t and draw v-t

(ii) Derive x9t) and hence calculate the displacement of the particle in the time interval from t=2 sec to t=4 sec

Assume that x=0,v=0 at t=0 ????

please help

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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