give reason-it is easier to stopa tennis ball as compared to a cricket ball when both are travelling with same velocity
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It depends upon the frame of reference of the observer. It can be considered uniform and non-uniform too. For a person who knows relativity, the idea of absolute rest/motion is funny.
Still, I will explain it in an easy manner.
Suppose, the object is a ball kept on your bed and you are standing still near it. Now the ball seems to be at rest ie, the velocity equals 0 and it is uniform because it doesn't change. Hence it has a uniform velocity(although zero) , with respect to you.
velocity in the above case is a NULL vector.
But for an imaginary observer on The Sun, the ball , which is kept on the earth is revolving around the sun at a very high speed. Hence it has a velocity changing direction every moment(circular motion), hence velocity is non-uniform in this case because it is changing magnitude as well as direction with respect to the sun based observer.
Still, I will explain it in an easy manner.
Suppose, the object is a ball kept on your bed and you are standing still near it. Now the ball seems to be at rest ie, the velocity equals 0 and it is uniform because it doesn't change. Hence it has a uniform velocity(although zero) , with respect to you.
velocity in the above case is a NULL vector.
But for an imaginary observer on The Sun, the ball , which is kept on the earth is revolving around the sun at a very high speed. Hence it has a velocity changing direction every moment(circular motion), hence velocity is non-uniform in this case because it is changing magnitude as well as direction with respect to the sun based observer.
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