Dear Sir,
I have an enquiry about a question from the chapter motion in a straight line from class 11.Actually i couldnt see any link to ask questions from you on your site so i thought you to contact you this way.
QUESTION
The postion of a particle moving on the x-axis is given by
x=7.8 + 9.2t - 2.1t^3

with x in meteres and t in seconds . What is its velocity at t=3.5s ? Is the velocity constant or is it continyously changing ?

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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