a) Define uniform acceleration. What is the acceleration of the body movingwith uniform velocity?b) A particle moves over three quarters of a circle of radius r. What is themagnitude of its displacement?

**(A)Uniform Acceleration**: It is a type of acceleration in which the velocity of the body under motion changes by an equal amount in equal interval of time.

If a body is moving with uniform velocity then there is no change in the velocity of the body and hence, the acceleration will be ZERO.

**(B)**When a particle moves over three quarter of the circle then its displacement is given as under:

The body starts moving from point A and reaches point B. Then the displacement is 'd'

$d=\sqrt{{r}^{2}+{r}^{2}}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}d=r\sqrt{2}$

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