Q. 105.0( 2 Votes )

# Examine the graph

Answer :

First we need to understand that what is Uniform and Non-uniform motion , that is ,

Uniform motion – When a body travels equal distance in equal intervals of time then it is called uniform motion __which simply means that the velocity of the object must remain constant in this type of motion.__

Non Uniform motion – When a body travels unequal distance in equal intervals of time then the motion traced by the body is called non-uniform motion __which simply means that the body possesses some constant acceleration or at extreme cases it changes it’s acceleration with time.__

a). If we consider the full motion of the object that is from t=0s to t=6s , then we can say that the motion of the object is non uniform motion , even if we choose some portions of the graph then also it is non-uniform motion because there is no point where the velocity of the object is constant. Hence full motion is non-uniform.

b). UNIFORMLY ACCELERATED MOTION – It means that when body changes equal amounts of velocity in equal intervals of time then it is called uniformly accelerated motion __which simply means that the acceleration of the body should remain constant.__

If we divide the full motion into two parts and then look at them one at a time , the parts should be first from t=0s to t=4s(point A) and second the rest from point A to point B , Then the two motions are called uniformly accelerated motions. So , yes from t=0s till point A the object is in uniformly accelerated motion.

Hence from point A to point B the object now also follows uniformly accelerated motion but with different magnitude of acceleration which was in t=0s till point A. __Hence this time it has deceleration or retardation which means negative of acceleration simply which reduces velocity__ and at the end Point B the object is at rest.

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