1. ​​if acceleration is varying with time we does not use kinematics equation,.we will use this equation for constant acceleration why plzexplain?

Dear Student,

The three kinematics equations of motion are derived only for the uniformly accelerated motion or for the motions for which acceleration is constant. 

That is why we can use these equations for constant acceleration only. 

If we need to work with the motion that contain variable acceleration, for that we use methods of integration and differentiation to solve the problem, which is a bit complex. 


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