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Q.
When the velocity of body is variable, then
Motion in a Straight Line
Solution:
If velocity is changing they may change in magnitude or direction or both.
(i) So, if velocity is changing in direction only the magnitude is constant so speed is constant.
(ii) If only direction of velocity is changing and magnitude is constant then acceleration will also be constant in magnitude (in case of uniform circular motion).
(iii) Average acceleration may be constant.
$a_{ av }=\frac{v_{2}-v_{1}}{t_{2}-t_{1}}$