Concept:In uniform circular motion, the speed is constant but the direction continuously changes, so the velocity is tangential and the acceleration is centripetal.
Explanation:At every instant, the body's velocity
v acts along the tangent to the circular path.
Since the speed is constant, there is no tangential acceleration.
The only acceleration present is centripetal acceleration
a, which points toward the centre of the circle.
Therefore, the correct diagram must show
v along the tangent and
a directed inward toward the centre.
Any diagram showing acceleration outward or velocity directed radially is wrong.
Comparing the given diagrams, the third diagram satisfies both conditions.
Answer:Option C (III)
