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'

$$\begin{gathered} d=\sqrt{r^2 + r^2} \\ d= r\sqrt{2} \end{gathered}$$