1.

The velocity of particle at any instant is 10 metre per second after 5 second the velocity of particle is 20 metre per second the velocity at 3 second before his

Answer»

We first get the ACCELERATION of the particle.


Acceleration = change in speed / change in time


This equals to :


20 - 10 = 10


10 / 2 = 5m/s²


The speed after 3 SECONDS is :


(V - 10) / 3 = 5


V - 10 = 15


V = 25 m / s



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