Question

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 1

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